The D and F-Block Elements
189 JEE Chemistry previous year questions on The D and F-Block Elements — options free on every question; 19 include the answer & explanation free, the rest unlock with PYQ Pass.
A first row transition metal with highest enthalpy of atomisation, upon reaction with oxygen at high temperature forms oxides of formula \({\mathrm{M}}_{2}{\mathrm{O}}_{\mathrm{n}}\) (where n =3,4, 5). The 'spin-only' magnetic moment value of the amphoteric oxide from the above oxides is ________ BM (nearest integer)
(Given atomic number: \((\mathrm{Sc}:21,\mathrm{Ti}:22,\mathrm{V}:23,\mathrm{Cr}:24,\mathrm{Mn}:25,\mathrm{Fe}:26,\mathrm{Co}:27,\mathrm{Ni}:28,\mathrm{Cu}:29,\mathrm{Zn}:30)\)) EndFragment
[JEE Main 2024, 04 Apr (Shift 2)]
0
'V' has highest enthalpy of atomisation (515 kJ/mol) among first row transition elements.
V2O5
Here 'V' is in +5 oxidation state
V+5 \(\Rightarrow\)1s2 2s2 2p6 3s2 3p6 (no unpaired electrons)
A first row transition metal with highest enthalpy of atomisation, upon reaction with oxygen at high temperature forms oxides of formula \({\mathrm{M}}_{2}{\mathrm{O}}_{\mathrm{n}}\) (where n =3,4, 5). The 'spin-only' magnetic moment value of the amphoteric oxide from the above oxides is ________ BM (nearest integer)
(Given atomic number: \((\mathrm{Sc}:21,\mathrm{Ti}:22,\mathrm{V}:23,\mathrm{Cr}:24,\mathrm{Mn}:25,\mathrm{Fe}:26,\mathrm{Co}:27,\mathrm{Ni}:28,\mathrm{Cu}:29,\mathrm{Zn}:30)\)) EndFragment
[JEE Main 2024, 04 Apr (Shift 2)]
0
'V' has highest enthalpy of atomisation (515 kJ/mol) among first row transition elements.
V2O5
Here 'V' is in +5 oxidation state
V+5 \(\Rightarrow\)1s2 2s2 2p6 3s2 3p6 (no unpaired electrons)
Alkaline oxidative fusion of \(MnO _2\) gives "A" which on electrolytic oxidation in alkaline solution produces B. A and B respectively are
[JEE Main 2024, 30 Jan (Shift 2)]
\(MnO _4^{2-}\) and \(MnO _4^{-}\)
Alkaline oxidative fusion of MnO2:
\(2{\mathrm{MnO}}_{2}+4{\mathrm{OH}}^{−}+{\mathrm{O}}_{2}\to 2{\mathrm{MnO}}_{4}^{2−}+2{\mathrm{H}}_{2}\mathrm{O}\)
Electrolytic oxidation of \({\mathrm{MnO}}_{4}^{2−}\) in alkaline medium.
\({\mathrm{MnO}}_{4}^{2−}\to {\mathrm{MnO}}_{4}^{−}+{\mathrm{e}}^{−}\)
Alkaline oxidative fusion of \(MnO _2\) gives "A" which on electrolytic oxidation in alkaline solution produces B. A and B respectively are
[JEE Main 2024, 30 Jan (Shift 2)]
\(MnO _4^{2-}\) and \(MnO _4^{-}\)
Alkaline oxidative fusion of MnO2:
\(2{\mathrm{MnO}}_{2}+4{\mathrm{OH}}^{−}+{\mathrm{O}}_{2}\to 2{\mathrm{MnO}}_{4}^{2−}+2{\mathrm{H}}_{2}\mathrm{O}\)
Electrolytic oxidation of \({\mathrm{MnO}}_{4}^{2−}\) in alkaline medium.
\({\mathrm{MnO}}_{4}^{2−}\to {\mathrm{MnO}}_{4}^{−}+{\mathrm{e}}^{−}\)
Which of the following pair of ions are same coloured?
(Memory Based JEE Mains 23/01/2025 ,Shift -1)
\({\mathrm{Cr}}^{2+},{\mathrm{Cu}}^{2+}\)
Both \({\mathrm{Cr}}^{2+}\mathrm{and}{\mathrm{Cu}}^{2+}\)are blue in colour
Among \(\mathrm{CrO},{\mathrm{Cr}}_{2}{\mathrm{O}}_{3}\) and \({\mathrm{CrO}}_{3}\), the sum of spin-only magnetic moment values of basic and amphoteric oxides is_____\(\times {10}^{-2}\mathrm{BM}\) (nearest integer).
(Given atomic number of \(\mathrm{Cr}\) is 24 )
[JEE Main 2024, 06 Apr (Shift 1)]
877
CrO Basic oxide
\({\mathrm{Cr}}_{2}{\mathrm{O}}_{3}\) Amphoteric oxide
In \(\mathrm{CrO},\mathrm{Cr}\) exist as \({\mathrm{Cr}}^{+2}\) and have \(\mu\) only \(=4.90\)
In \({\mathrm{Cr}}_{2}{\mathrm{O}}_{3},\mathrm{Cr}\) exist as \({\mathrm{Cr}}^{+3}\) and have \(\mu\) only \(=3.87\)
Sum of spin only magnetic moment
\(=4.90+3.87=8.77\)
\({\mu }_{\text{only }}=877\times {10}^{-2}\)
Ans. 877
Among \(\mathrm{CrO},{\mathrm{Cr}}_{2}{\mathrm{O}}_{3}\) and \({\mathrm{CrO}}_{3}\), the sum of spin-only magnetic moment values of basic and amphoteric oxides is_____\(\times {10}^{-2}\mathrm{BM}\) (nearest integer).
(Given atomic number of \(\mathrm{Cr}\) is 24 )
[JEE Main 2024, 06 Apr (Shift 1)]
877
CrO Basic oxide
\({\mathrm{Cr}}_{2}{\mathrm{O}}_{3}\) Amphoteric oxide
In \(\mathrm{CrO},\mathrm{Cr}\) exist as \({\mathrm{Cr}}^{+2}\) and have \(\mu\) only \(=4.90\)
In \({\mathrm{Cr}}_{2}{\mathrm{O}}_{3},\mathrm{Cr}\) exist as \({\mathrm{Cr}}^{+3}\) and have \(\mu\) only \(=3.87\)
Sum of spin only magnetic moment
\(=4.90+3.87=8.77\)
\({\mu }_{\text{only }}=877\times {10}^{-2}\)
Ans. 877
The correct decreasing order of spin only magnetic moment values (BM) of \({\mathrm{Cu}}^{+},{\mathrm{Cu}}^{2+}{\mathrm{Cr}}^{2+}\) and \({\mathrm{Cr}}^{3+}\) ions is :
[JEE Main 2025, 8 Apr (Shift 1)]
\({\mathrm{Cr}}^{2+}>{\mathrm{Cr}}^{3+}>{\mathrm{Cu}}^{2+}>{\mathrm{Cu}}^{+}\)
Cu+ : [Ar] 3d10 , Spin only magnetic moment = 0 B.M.
Cu+2 : [Ar] 3d9 ,Spin only magnetic moment = 1.73 B.M.
Cr+2 : [Ar] 3d4 ,Spin only magnetic moment = 4.90 B.M.
Cr+3 : [Ar] 3d3 ,Spin only magnetic moment = 3.87 B.M.
Order of µ : Cr+2 > Cr+3 > Cu+2 > Cu+
The electronic configuration of Einsteinium is :
(Given atomic number of Einsteinium =99)
[JEE Main 2024, 9 Apr (Shift 2)]
\([Rn]5{f}^{11}6d^\circ 7{s}^{2}\)
Correct electronic configuration of Einstenium = [Rn] 5f11 6d0 7s2
The oxidation state of chromium in the final product formed in the reaction between KI and acidified \({K}_{2}C{r}_{2}{O}_{7}\) solution is:
[JEE Main 2026, 23 Jan (Shift 2)]
+3
\({\mathrm{K}}_{2}{\mathrm{Cr}}_{2}{\mathrm{O}}_{7}+\mathrm{KI}\overset{{\mathrm{H}}^{+}}{\to }{\mathrm{I}}_{2}+{\mathrm{Cr}}^{3+}\)
Lanthanoid ions with \(4{f}^{7}\) configuration are :
(A) \(E{u}^{2+}\)
(B) \(G{d}^{3+}\)
(C) \(E{u}^{3+}\)
(D) \(T{b}^{3+}\)
(E) \(S{m}^{2+}\)
Choose the correct answer from the options given below
(A) and (B) only
\(E{u}^{2+}:[Xe]4{f}^{7}6{s}^{0}\\ G{d}^{3+}:[Xe]4{f}^{7}5{d}^{0}6{s}^{0}\\ E{u}^{3+}:[Xe]4{f}^{6}6{s}^{0}\\ T{b}^{3+}:[Xe]4{f}^{8}6{s}^{0}\\ S{m}^{2+}:[Xe]4{f}^{6}6{s}^{0}\)
Hence, only \(E{u}^{2+}\) and \(G{d}^{3+}\) have \(4{f}^{7}\) configuration.
Which of the following pair of ions are coloured?
(JEE Mains 23/01/2025, Shift - I, Memory Based )
\({\mathrm{Cr}}^{2+},{\mathrm{Cu}}^{2+}\)
\({\mathrm{Cr}}^{2+},{\mathrm{Cu}}^{2+},\)both are blue in colour.
The correct decreasing order of spin only magnetic moment values (BM) of \({\mathrm{Cu}}^{+},{\mathrm{Cu}}^{2+}{\mathrm{Cr}}^{2+}\) and \({\mathrm{Cr}}^{3+}\) ions is :
[JEE Main 2025, 8 Apr (Shift 1)]
\({\mathrm{Cr}}^{2+}>{\mathrm{Cr}}^{3+}>{\mathrm{Cu}}^{2+}>{\mathrm{Cu}}^{+}\)
Cu+ : [Ar] 3d10 , Spin only magnetic moment = 0 B.M.
Cu+2 : [Ar] 3d9 ,Spin only magnetic moment = 3 B.M.
Cr+2 : [Ar] 3d4 ,Spin only magnetic moment = 24 B.M.
Cr+3 : [Ar] 3d3 ,Spin only magnetic moment = 15 B.M.
Order of µ : Cr+2 > Cr+3 > Cu+2 > Cu+
The metal that shows highest and maximum number of oxidation state is :
[JEE Main 2024, 5 Apr (Shift 1)]
Mn
Correct answer: C. Mn (Manganese)
Explanation:
Manganese shows the highest and maximum number of oxidation states among the given options, commonly from +2 to +7 (e.g., Mn²⁺, Mn³⁺, Mn⁴⁺, Mn⁶⁺, Mn⁷⁺), due to the participation of both 3d and 4s electrons.
Given below are two statements:
Statement I: The number of pairs, from the following, in which both the ions are coloured in aqueous solution is 3.
\(\left[{\text{Sc}}^{3+},{\text{Ti}}^{3+}\right],\left[{\text{Mn}}^{2+},{\text{Cr}}^{2+}\right],\left[{\text{Cu}}^{2+},{\text{Zn}}^{2+}\right]\) and \(\left[{\text{Ni}}^{2+},{\text{Ti}}^{4+}\right]\)
Statement II: \({\text{Th}}^{4+}\) is the strongest reducing agent among \({\text{Th}}^{4+},{\text{Ce}}^{4+},{\text{Gd}}^{3+}\) and \({\text{Eu}}^{2+}\).
In the light of the above statements, choose the correct answer from the options given below
[JEE Main 2026, 28 Jan (Shift 1)]
Both Statement I and Statement II are false
Sc3+, Ti4+ and Zn2+ are colourless
Th4+ cannot act as a reducing agent.
Which of the following electronic configuration would be associated with the highest magnetic moment?
[JEE Main 2024, 27 Jan (Shift 1)]
\([ Ar ] 3 d ^6\)
Magnetic moment is given by:
μ = √[n(n + 2)] BM
(where n = number of unpaired electrons)
Count unpaired electrons using Hund’s rule:
A. [Ar] 3d⁷ → 3 unpaired
B. [Ar] 3d³ → 3 unpaired
C. [Ar] 3d⁸ → 2 unpaired
D. [Ar] 3d⁶ → 4 unpaired
Compare magnetic moments:
n = 4 gives highest value of √[n(n + 2)]
Final Answer:
D. [Ar] 3d⁶
Which has a maximum oxidizing power among the following?
\({{\mathrm{MnO}}_{4}}^{-}\)
Among the given species, MnO₄⁻ has the highest standard reduction potential (E° ≈ +1.52 V), making it the strongest oxidizing agent. Comparatively, Cr₂O₇²⁻ (E° ≈ +1.33 V), VO₂⁺ (E° ≈ +1.00 V), and TiO₂ are weaker oxidizers. Answer: MnO₄⁻.
Identity the incorrect pair from the following :
[JEE Main 2024, 27 Jan (Shift 2)]
Wacker process - \(\mathrm{Pt} \mathrm{Cl}_{2}\)
The catalyst used in Wacker's process is PdCl2.
Identity the incorrect pair from the following :
[JEE Main 2024, 27 Jan (Shift 2)]
Wacker process - \(\mathrm{Pt} \mathrm{Cl}_{2}\)
The catalyst used in Wacker's process is PdCl2.
Consider the following reactions
\({\mathrm{K}}_{2}{\mathrm{Cr}}_{2}{\mathrm{O}}_{7}\overset{\mathrm{KOH}}{\to }\mathrm{A}\overset{{\mathrm{H}}_{2}{\mathrm{SO}}_{4}}{\to }\mathrm{B}+{\mathrm{K}}_{2}{\mathrm{SO}}_{4}\)
The products A and B respectively are
[JEE Main 2025, 23 Jan (Shift 2)]
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Alkaline oxidative fusion of \(MnO _2\) gives "A" which on electrolytic oxidation in alkaline solution produces B. A and B respectively are
[JEE Main 2024, 30 Jan (Shift 2)]
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The transition metal having highest \(3^{\text {rd }}\) ionisation enthalpy is :
[JEE Main 2024, 01 Feb (Shift 2)]
EndFragment
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The transition metal having highest \(3^{\text {rd }}\) ionisation enthalpy is :
[JEE Main 2024, 01 Feb (Shift 2)]
EndFragment
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\({\mathrm{KMnO}}_{4}\) acts as an oxidising agent in acidic medium. ‘X’ is the difference between the oxidation states of Mn in reactant and product. ‘Y’ is the number of ‘d’ electrons present in the brown red precipitate formed at the end of the acetate ion test with neutral ferric chloride. The value of X + Y is
[JEE Main 2025, 4 Apr (Shift 1)]
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\(\mathrm{KMnO}_{4}\) decomposes on heating at \(513 \mathrm{~K}\) to form \(\mathrm{O}_{2}\) along with
[JEE Main 2024, 29 Jan (Shift 1)]
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\(\mathrm{KMnO}_{4}\) decomposes on heating at \(513 \mathrm{~K}\) to form \(\mathrm{O}_{2}\) along with
[JEE Main 2024, 29 Jan (Shift 1)]
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The electronic configuration for Neodymium is
[Atomic Number for Neodymium \(60\)]
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The oxidation state of chromium in the final product formed in the reaction between KI and acidified \({K}_{2}C{r}_{2}{O}_{7}\) solution is:
[JEE Main 2026, 23 Jan (Shift 2)]
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Consider the following oxides,
\({\mathrm{V}}_{2}{\mathrm{O}}_{3},{\mathrm{V}}_{2}{\mathrm{O}}_{4}\mathrm{and}{\mathrm{V}}_{2}{\mathrm{O}}_{5}\)
Change in oxidation state of vanadium when amphoteric oxide reacts with acids to form \({{\mathrm{VO}}_{2}}^{+}\mathrm{is}\) (Memory Based Question 28/Jan/25 Evening shift)
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Identity the incorrect pair from the following :
[JEE Main 2024, 27 Jan (Shift 2)]
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Choose the correct statements from the following
A. \({\mathrm{Mn}}_{2}{\mathrm{O}}_{7}\) is an oil at room temperature
B. \({\mathrm{V}}_{2}{\mathrm{O}}_{4}\) reacts with acid to give \({\mathrm{VO}}_{2}^{2+}\)
C. CrO is a basic oxide
D. \({\mathrm{V}}_{2}{\mathrm{O}}_{5}\) does not react with acid
Choose the correct answer from the options given below:
[JEE Main 2024, 31 Jan (Shift 2)]
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The amphoteric oxide among \({V}_{2}{O}_{3},{V}_{2}{O}_{4}\) and \({V}_{2}{O}_{5}\), upon reaction with alkali leads to formation of an oxide anion. The oxidation state of V in the oxide anion is
[JEE Main 2025, 28 Jan (Shift 2)]
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The incorrect relationship in the following pairs in relation to ionisation enthalpies is
[JEE Main 2025, 4 Apr (Shift 2)]
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"X" is an oxoanion of the lightest element of group 7 (in the periodic table). The metal is in +6 oxidation state in "X". The color of the potassium salt of X is
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Which of the following statements are correct about \(Zn , Cd\) and \(Hg\) ?
A. They exhibit high enthalpy of atomization as the d-subshell is full.
B. \(Zn\) and \(Cd\) do not show variable oxidation state while \(Hg\) shows \(+ I\) and \(+ II\).
C. Compounds of \(Zn , Cd\) and \(Hg\) are paramagnetic in nature.
D. \(Zn , Cd\) and \(Hg\) are called soft metals.
Choose the most appropriate from the options given below:
[JEE Main 2024, 29 Jan (Shift 2)]
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Which of the following statements are correct about \(Zn , Cd\) and \(Hg\) ?
A. They exhibit high enthalpy of atomization as the d-subshell is full.
B. \(Zn\) and \(Cd\) do not show variable oxidation state while \(Hg\) shows \(+ I\) and \(+ II\).
C. Compounds of \(Zn , Cd\) and \(Hg\) are paramagnetic in nature.
D. \(Zn , Cd\) and \(Hg\) are called soft metals.
Choose the most appropriate from the options given below:
[JEE Main 2024, 29 Jan (Shift 2)]
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The metal ions that have the calculated spin only magnetic moment value of 4.9 B.M. are
A. \({\mathrm{Cr}}^{2+}\)
B. \({\mathrm{Fe}}^{2+}\)
C. \({\mathrm{Fe}}^{3+}\)
D. \({\mathrm{Co}}^{2+}\)
E. \({\mathrm{Mn}}^{3+}\)
Choose the correct answer from the options given below
[JEE Main 2025, 3 Apr (Shift 1)]
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The number of valence electrons present in the metal among Cr, Co, Fe and Ni which has the lowest enthalpy of atomisation is
[JEE Main 2025, 7 Apr (Shift 1)]
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Which of the following is the strongest oxidising agent ? (Jee mains shift-1 memory based 24/01/2025).
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Choose the correct option having all the elements with \(d ^{10}\) electronic configuration from the following :
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Consider the following element in in TI, Al, and Pb .The most stable oxidation states of elements with highest and lowest first Ionisation enthalpies, respectively are:
Memory Based Question 28/Jan/25 Morning shift
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Which has a maximum oxidizing power among the following?
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Which of the following ions is the strongest oxidizing agent?
(Atomic Number of Ce = 58, Eu = 63, Tb = 65, Lu = 71)
[JEE Main 2025, 24 Jan (Shift 1)]
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The electronic configuration for Neodymium is
[Atomic Number for Neodymium \(60\)]
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Which of the following pair of ions are same coloured?
(Memory Based JEE Mains 23/01/2025 ,Shift -1)
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Given below are two statements:
Statement I : The first ionization enthalpy of Cr is lower than that of Mn.
Statement II: The second and third ionization enthalpies of Cr are higher than those of Mn.
In the light of the above statements, choose the correct answer from the options given below:
[JEE Main 2026, 22 Jan (Shift 2)]
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Consider the following statements about manganate and permanganate ions. Identify the correct statements.
A. The geometry of both manganate and permanganate ions is tetrahedral.
B. The oxidation states of Mn in manganate and permanganate are +7 and +6, respectively.
C. Oxidation of Mn(II) salt by peroxodisulphate gives manganate ion as the final product.
D. Manganate ion is paramagnetic and permanganate ions is diamagnetic.
E. Acidified permanganate ion reduces oxalate, nitrite and iodide ions.
Choose the correct answer from the options given below:
[JEE Main 2026, 28 Jan (Shift 2)]
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Given below are two statements:
Statement I: The number of pairs, from the following, in which both the ions are coloured in aqueous solution is 3.
\(\left[{\text{Sc}}^{3+},{\text{Ti}}^{3+}\right],\left[{\text{Mn}}^{2+},{\text{Cr}}^{2+}\right],\left[{\text{Cu}}^{2+},{\text{Zn}}^{2+}\right]\) and \(\left[{\text{Ni}}^{2+},{\text{Ti}}^{4+}\right]\)
Statement II: \({\text{Th}}^{4+}\) is the strongest reducing agent among \({\text{Th}}^{4+},{\text{Ce}}^{4+},{\text{Gd}}^{3+}\) and \({\text{Eu}}^{2+}\).
In the light of the above statements, choose the correct answer from the options given below
[JEE Main 2026, 28 Jan (Shift 1)]
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Given below are two statements :
Statement (I) : Fusion of \(MnO _2\) with \(KOH\) and an oxidising agent gives dark green \(K _2 MnO _4\).
Statement (II) : Manganate ion on electrolytic oxidation in alkaline medium gives permanganate ion.
In the light of the above statements, choose the correct answer from the options given below :
[JEE Main 2024, 08 Apr (Shift 2)]
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Given below are two statements :
Statement (I) : Fusion of \(MnO _2\) with \(KOH\) and an oxidising agent gives dark green \(K _2 MnO _4\).
Statement (II) : Manganate ion on electrolytic oxidation in alkaline medium gives permanganate ion.
In the light of the above statements, choose the correct answer from the options given below :
[JEE Main 2024, 08 Apr (Shift 2)]
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Consider the following element in in TI, Al, and Pb .The most stable oxidation states of elements with highest and lowest first Ionisation enthalpies, respectively are:
Memory Based Question 28/Jan/25 Morning shift
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Which of the following ions is the strongest oxidizing agent?
(Atomic Number of Ce = 58, Eu = 63, Tb = 65, Lu = 71)
[JEE Main 2025, 24 Jan (Shift 1)]
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Which of the following oxidation reactions are carried out by both \({K}_{2}C{r}_{2}{O}_{7}\) and \(KMn{O}_{4}\) in acidic medium?
A. \({I}^{–}\to {I}_{2}\)
B. \({S}^{2-}\to S\)
C. \(F{e}^{2+}\to F{e}^{3+}\)
D. \({I}^{–}\to I{O}_{3}^{-}\)
E. \({S}_{2}{O}_{3}^{2-}\to S{O}_{4}^{2-}\)
Choose the correct answer from the options given below:
[JEE Main 2025, 28 Jan (Shift 1)]
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Given below are two statements:
Statement I : The first ionization enthalpy of Cr is lower than that of Mn.
Statement II: The second and third ionization enthalpies of Cr are higher than those of Mn.
In the light of the above statements, choose the correct answer from the options given below:
[JEE Main 2026, 22 Jan (Shift 2)]
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\(A\) and \(B\) formed in the following reactions are
\[\begin{aligned}& CrO _2 Cl _2+4 NaOH \rightarrow A +2 NaCl +2 H _2 O \\& A +2 HCl +2 H _2 O _2 \rightarrow B +3 H _2 O\end{aligned}\]
[JEE Main 2024, 30 Jan (Shift 2)]
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\(A\) and \(B\) formed in the following reactions are
\[\begin{aligned}& CrO _2 Cl _2+4 NaOH \rightarrow A +2 NaCl +2 H _2 O \\& A +2 HCl +2 H _2 O _2 \rightarrow B +3 H _2 O\end{aligned}\]
[JEE Main 2024, 30 Jan (Shift 2)]
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The first transition series metal ' M ' has the highest enthalpy of atomisation in its series. One of its aquated ion \(\left({\mathrm{M}}^{\text{n+ }}\right)\) exists in green colour. The nature of the oxide formed by the above \({\mathrm{M}}^{\mathrm{n}+}\) ion is
[JEE Main 2025, 7 Apr (Shift 1)]
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Assertion (A): In aqueous solutions \(Cr ^{2+}\) is reducing while \(Mn ^{3+}\) is oxidising in nature.
Reason (R): Extra stability to half filled electronic configuration is observed than incompletely filled electronic configuration.
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The number of valence electrons present in the metal among Cr, Co, Fe and Ni which has the lowest enthalpy of atomisation is
[JEE Main 2025, 7 Apr (Shift 1)]
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Consider ' n ' is the number of lone pair of electrons present in the equatorial position of the most stable structure of \(Cl{F}_{3}\). The ions from the following with ' n ' number of unpaired electrons are
A. \({V}^{3+}\)
B. \(T{i}^{3+}\)
C. \(C{u}^{2+}\)
D. \(N{i}^{2+}\)
E. \(T{i}^{2+}\)
Choose the correct answer from the options given below:
[JEE Main 2025, 28 Jan (Shift 1)]
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Preparation of potassium permanganate from \(Mn{O}_{2}\) involves two step process in which the 1st step is a reaction with KOH and \(KN{O}_{3}\) to produce
[JEE Main 2025, 24 Jan (Shift 1)]
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The metal ions that have the calculated spin only magnetic moment value of 4.9 B.M. are
A. \({\mathrm{Cr}}^{2+}\)
B. \({\mathrm{Fe}}^{2+}\)
C. \({\mathrm{Fe}}^{3+}\)
D. \({\mathrm{Co}}^{2+}\)
E. \({\mathrm{Mn}}^{3+}\)
Choose the correct answer from the options given below
[JEE Main 2025, 3 Apr (Shift 1)]
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Niobium (Nb) and ruthenium (Ru) have 'x' and 'y' number of electrons in their respective 4d orbitals. The value of x+y is ______.
[JEE Main 2025, 22 Jan (Shift 2)]
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The correct set of ions (aqueous solution) with same colour from the following is:
[JEE Main 2025, 23 Jan (Shift 1)]
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The first transition series metal ' M ' has the highest enthalpy of atomisation in its series. One of its aquated ion \(\left({\mathrm{M}}^{\text{n+ }}\right)\) exists in green colour. The nature of the oxide formed by the above \({\mathrm{M}}^{\mathrm{n}+}\) ion is
[JEE Main 2025, 7 Apr (Shift 1)]
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One of the products formed from the reaction of permanganate ion with iodide ion in neutral aqueous medium is
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The spin-only magnetic moment value of the ion among \(T{i}^{2+},{V}^{2+},C{o}^{3+}\) and \(C{r}^{2+}\), that acts as strong oxidising agent in aqueous solution is _________ BM (Nearest integer).
(Given atomic numbers : \(\mathrm{Ti}:22,\mathrm{V}:23,\mathrm{Cr}:24,\mathrm{Co}:27\) )
[JEE Main 2024, 5 Apr (Shift 1)]
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One of the products formed from the reaction of permanganate ion with iodide ion in neutral aqueous medium is
[JEE Advanced 2025, Paper-1]
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The correct decreasing order of spin only magnetic moment values (BM) of \({\mathrm{Cu}}^{+},{\mathrm{Cu}}^{2+}{\mathrm{Cr}}^{2+}\) and \({\mathrm{Cr}}^{3+}\) ions is :
[JEE Main 2025, 8 Apr (Shift 1)]
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"X" is an oxoanion of the lightest element of group 7 (in the periodic table). The metal is in +6 oxidation state in "X". The color of the potassium salt of X is
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Which of the following is the strongest oxidising agent ? (Jee mains shift-1 memory based 24/01/2025).
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During preparation of potassium permanganate from manganese dioxide, the compound formed when manganese dioxide reacts with potassium hydroxide is (MEMORY based jee mains shift-1 24/01/2025)
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Which of the following does not belong to the same period in the modern periodic table?
(Memory Based JEE Mains 23/01/2025 ,Shift -1)
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Consider ' n ' is the number of lone pair of electrons present in the equatorial position of the most stable structure of \(Cl{F}_{3}\). The ions from the following with ' n ' number of unpaired electrons are
A. \({V}^{3+}\)
B. \(T{i}^{3+}\)
C. \(C{u}^{2+}\)
D. \(N{i}^{2+}\)
E. \(T{i}^{2+}\)
Choose the correct answer from the options given below:
[JEE Main 2025, 28 Jan (Shift 1)]
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Which of the following oxidation reactions are carried out by both \({K}_{2}C{r}_{2}{O}_{7}\) and \(KMn{O}_{4}\) in acidic medium?
A. \({I}^{–}\to {I}_{2}\)
B. \({S}^{2-}\to S\)
C. \(F{e}^{2+}\to F{e}^{3+}\)
D. \({I}^{–}\to I{O}_{3}^{-}\)
E. \({S}_{2}{O}_{3}^{2-}\to S{O}_{4}^{2-}\)
Choose the correct answer from the options given below:
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The electronic configuration for Neodymium is
[Atomic Number for Neodymium \(60\)]
[JEE Main 2024, 27 Jan (Shift 1)]
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The electronic configuration for Neodymium is
[Atomic Number for Neodymium \(60\)]
[JEE Main 2024, 27 Jan (Shift 1)]
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Which of the following electronic configuration would be associated with the highest magnetic moment?
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Consider the following oxides,
\({\mathrm{V}}_{2}{\mathrm{O}}_{3},{\mathrm{V}}_{2}{\mathrm{O}}_{4}\mathrm{and}{\mathrm{V}}_{2}{\mathrm{O}}_{5}\)
Change in oxidation state of vanadium when amphoteric oxide reacts with acids to form \({{\mathrm{VO}}_{2}}^{+}\mathrm{is}\) (Memory Based Question 28/Jan/25 Evening shift)
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The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is
\(T{i}^{2+},C{r}^{2+}\) and \({V}^{2+}\)
[JEE Main 2024, 5 Apr (Shift 2)]
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Which of the following pair of ions are coloured?
(JEE Mains 23/01/2025, Shift - I, Memory Based )
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Which of the following ions is the strongest oxidizing agent?
(Atomic Number of Ce = 58, Eu = 63, Tb = 65, Lu = 71)
[JEE Main 2025, 24 Jan (Shift 1)]
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The incorrect relationship in the following pairs in relation to ionisation enthalpies is
[JEE Main 2025, 4 Apr (Shift 2)]
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Among, Sc, Mn, Co and Cu, identify the element with highest enthalpy of atomisation. The spin only magnetic moment value of that element in its +2 oxidation state is _____ BM (in nearest integer)
[JEE Main 2025, 3 Apr (Shift 2)]
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Given below are two statements :
Statement I : \({\mathrm{CrO}}_{3}\) is a stronger oxidizing agent than \({\mathrm{MoO}}_{3}\)
Statement II : \(\mathrm{Cr}(\mathrm{VI})\)is more stable than \(\mathrm{Mo}(\mathrm{VI})\)
In the light of the above statements, choose the correct answer from the options given below
[JEE Main 2025, 3 Apr (Shift 2)]
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Given below are two statements
Statement (I) : The metallic radius of Al is less than that of Ga
Statement (II) : The ionic radius of \({\mathrm{Al}}^{3+}\) is less than that of \({\mathrm{Ga}}^{3+}\)
In the light of the above statements, choose the most appropriate answer from the options given below
[JEE Main 2025, 2 Apr (Shift 1)]
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The amphoteric oxide among \({V}_{2}{O}_{3},{V}_{2}{O}_{4}\) and \({V}_{2}{O}_{5}\), upon reaction with alkali leads to formation of an oxide anion. The oxidation state of V in the oxide anion is
[JEE Main 2025, 28 Jan (Shift 2)]
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Which of the following compounds show colour due to d-d transition?EndFragment
[JEE Main 2024, 01 Feb (Shift 2)]
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Which of the following compounds show colour due to d-d transition?EndFragment
[JEE Main 2024, 01 Feb (Shift 2)]
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In alkaline medium, \(\mathrm{MnO}_{4}^{-}\)oxidises \(\mathrm{I}^{-}\)to
[JEE Main 2024, 29 Jan (Shift 1)]
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In alkaline medium, \(\mathrm{MnO}_{4}^{-}\)oxidises \(\mathrm{I}^{-}\)to
[JEE Main 2024, 29 Jan (Shift 1)]
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Which has a maximum oxidizing power among the following?
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The element which shows only one oxidation state other than its elemental form is
[JEE Main 2024, 04 Apr (Shift 1)]
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The element which shows only one oxidation state other than its elemental form is
[JEE Main 2024, 04 Apr (Shift 1)]
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Which of the following does not belong to the same period in the modern periodic table?
(Memory Based JEE Mains 23/01/2025 ,Shift -1)
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Choose the correct option having all the elements with \(d ^{10}\) electronic configuration from the following :
[JEE Main 2024, 27 Jan (Shift 2)]
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Choose the correct option having all the elements with \(d ^{10}\) electronic configuration from the following :
[JEE Main 2024, 27 Jan (Shift 2)]
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Which of the following lanthanide ion has 7 electrons in its outer shell?
(Memory Based JEE Mains 22/01/2025 Shift-1)
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Give below are two statements :
Statement I : The higher oxidation states are more stable down the group among transition elements unlike p-block elements.
Statement II : Copper can not liberate hydrogen from weak acids.
In the light of the above statements, choose the correct answer from the options given below :
[JEE Main 2024, 9 Apr (Shift 2)]
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Consider the following statements about manganate and permanganate ions. Identify the correct statements.
A. The geometry of both manganate and permanganate ions is tetrahedral.
B. The oxidation states of Mn in manganate and permanganate are +7 and +6, respectively.
C. Oxidation of Mn(II) salt by peroxodisulphate gives manganate ion as the final product.
D. Manganate ion is paramagnetic and permanganate ions is diamagnetic.
E. Acidified permanganate ion reduces oxalate, nitrite and iodide ions.
Choose the correct answer from the options given below:
[JEE Main 2026, 28 Jan (Shift 2)]
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Which of the following pair of ions are coloured?
(JEE Mains 23/01/2025, Shift - I, Memory Based )
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Lanthanoid ions with \(4{f}^{7}\) configuration are :
(A) \(E{u}^{2+}\)
(B) \(G{d}^{3+}\)
(C) \(E{u}^{3+}\)
(D) \(T{b}^{3+}\)
(E) \(S{m}^{2+}\)
Choose the correct answer from the options given below
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The equilibrium \(Cr _2 O _7^{2-} \rightleftharpoons 2 CrO _4^{2-}\) is shifted to the right in :
[JEE Main 2024, 08 Apr (Shift 2)]
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The equilibrium \(Cr _2 O _7^{2-} \rightleftharpoons 2 CrO _4^{2-}\) is shifted to the right in :
[JEE Main 2024, 08 Apr (Shift 2)]
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A first row transition metal in its \(+2\) oxidation state has a spin-only magnetic moment value of \(3.86\mathrm{BM}\). The atomic number of the metal isEndFragment
[JEE Main 2024, 04 Apr (Shift 2)]
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A first row transition metal in its \(+2\) oxidation state has a spin-only magnetic moment value of \(3.86\mathrm{BM}\). The atomic number of the metal isEndFragment
[JEE Main 2024, 04 Apr (Shift 2)]
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Preparation of potassium permanganate from \(Mn{O}_{2}\) involves two step process in which the 1st step is a reaction with KOH and \(KN{O}_{3}\) to produce
[JEE Main 2025, 24 Jan (Shift 1)]
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The correct set of ions (aqueous solution) with same colour from the following is:
[JEE Main 2025, 23 Jan (Shift 1)]
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Which of the following statements are correct about \(Zn , Cd\) and \(Hg\) ?
A. They exhibit high enthalpy of atomization as the d-subshell is full.
B. \(Zn\) and \(Cd\) do not show variable oxidation state while \(Hg\) shows \(+ I\) and \(+ II\).
C. Compounds of \(Zn , Cd\) and \(Hg\) are paramagnetic in nature.
D. \(Zn , Cd\) and \(Hg\) are called soft metals.
Choose the most appropriate from the options given below:
[JEE Main 2024, 29 Jan (Shift 2)]
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The metal that shows highest and maximum number of oxidation state is :
[JEE Main 2024, 5 Apr (Shift 1)]
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A reagent which gives brilliant red precipitate with nickel ions in basic medium is
[JEE Main 2024, 29 Jan (Shift 2)]
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A reagent which gives brilliant red precipitate with nickel ions in basic medium is
[JEE Main 2024, 29 Jan (Shift 2)]
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The 'spin only' magnetic moment value of \(MO _4{ }^{2-}\) is _____. BM. (Where M is a metal having least metallic radii among \(Sc , Ti , V , Cr , Mn\) and \(Zn\) ).
(Given atomic number: \(Sc =21, Ti =22, V =23, Cr =24, Mn =25\) and \(Zn =30\) )
[JEE Main 2024, 08 Apr (Shift 1)]
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The 'spin only' magnetic moment value of \(MO _4{ }^{2-}\) is _____. BM. (Where M is a metal having least metallic radii among \(Sc , Ti , V , Cr , Mn\) and \(Zn\) ).
(Given atomic number: \(Sc =21, Ti =22, V =23, Cr =24, Mn =25\) and \(Zn =30\) )
[JEE Main 2024, 08 Apr (Shift 1)]
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How many of the following metal ions have similar value of spin only magnetic moment in gaseous state?
\(V ^{3+} , Cr ^{3+}, Fe ^{2+}, Ni ^{3+}\)
(Given: Atomic number: V-23 ; Cr-24 ; Fe-26 ; Ni-28)
[JEE Main 2023, 25 Jan (Shift 1)]
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The set of correct statements is:
(i) Manganese exhibits +7 oxidation state in its oxide.
(ii) Ruthenium and Osmium exhibit +8 oxidation in their oxides.
(iii) Sc shows +4 oxidation state which is oxidizing in nature.
(iv) Cr shows oxidising nature in +6 oxidation state.
[JEE Main 2023, 29 Jan (Shift 2)]
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The stability of \(\mathrm{Cu}^{2+}\) is more than \(\mathrm{Cu}^{+}\)salts in aqueous solution due to:
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The incorrect statement among the following is:
[JEE Main 2021, 24 Feb (Shift 2)]
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| List -I(Alloys) | List -II (Metals) |
| A. Bronze | (i) Fe, Cr and Ni |
| B. Stainless steel | (ii) Cu and Sn |
| C. U K gold coin | (iii) Cu and Zn |
| D.Brass | (iv) Ag , Cu , Zn and Ni |
(Memory Based JEE Mains 23/01/2025 ,Shift -2)
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The incorrect statement among the following is:
[NEET 2021]
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\(KMnO _4\) oxidises \(I ^{-}\)in acidic and neutral/faintly alkaline solution, respectively to
[JEE Main 2023, 30 Jan (Shift 2)]
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Which halogen is known to cause the reaction given below:
\(2 Cu ^{2+}+4 X ^{-} \rightarrow Cu _2 X _2( s )+ X _2\)
[JEE Main 2023, 8 Apr (Shift 1)]
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A chloride salt solution acidified with dil. \(HNO _3\) gives a curdy white precipitate, \([ A ]\), on addition of \(AgNO _3\). [A] on treatment with \(NH _4 OH\) gives a clear solution, \(B\). A and B are respectively
[JEE Main 2023, 25 Jan (Shift 2)]
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Number of electrons that Vanadium \( (\mathrm{Z}=23) \) has in \( \mathrm{p} \)-orbitals is equal to ____
[JEE Main 2021, 22 Jul (Shift 2)]
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The number of statement(s) correct from the following for Copper (At no.29) is / are____________
(a) \(Cu ( II )\) complexes are always paramagnetic
(b) \(Cu ( I )\) complexes are generally colourless
(c) \(Cu ( I )\) is easily oxidized
(d) In Fehling solution, the active reagent has \(Cu ( I )\)
[JEE Main 2022, 27 June (Shift 1)]
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A solution of \(\mathrm{CrO _5}\) in amyl alcohol has a _____ colour
[JEE Main 2023, 29 Jan (Shift 2)]
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Given below are two statements:
Statement-I: \(CeO _2\) can be used for oxidation of aldehydes and ketones.
Statement-II: Aqueous solution of \(EuSO _4\) is a strong reducing agent.
In the light of the above statements, choose the correct answer from the options given below
[JEE Main 2021, 25 Feb (Shift 1)]
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Which of the following elements have half-filled f-orbitals in their ground state?
(Given : atomic number)
\(Sm =62 ; Eu =63 ; Tb =65 ; Gd =64, Pm =61\)
A. \(Sm\)
B. \(Eu\)
C. \(Tb\)
D. Gd
E. Pm
Choose the correct answer from the options given below:
[JEE Main 2023, 31 Jan (Shift 2)]
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A chloride salt solution acidified with dil. \(HNO _3\) gives a curdy white precipitate, \([ A ]\), on addition of \(AgNO _3\). [A] on treatment with \(NH _4 OH\) gives a clear solution, \(B\)
[JEE Main 2023, 25 Jan (Shift 2)]
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Which one of the following lanthanoids does not form MO2 ?
[ M is lanthanoid metal ]
[JEE Main 2021, 26 Feb (Shift 1)]
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In which of the following pairs, the outer most electronic configuration will be the same?
[JEE Main 2021, 25 Feb (Shift 1)]
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An acidified solution of potassium chromate was layered with an equal volume of amyl alcohol. When it was shaken after the addition of \( 1 \mathrm{~mL} \) of \( 3 \% \mathrm{~H}_{2} \mathrm{O}_{2} \), a blue alcohol layer was obtained. The blue color is due to the formation of a chromium (VI) compound \( X^{\prime} \). What is the number of oxygen atoms bonded to chromium through only single bonds in a molecule of\( \mathbf{X} \) ?
[JEE Advanced 2020, Paper-2]
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The lanthanoid that does NOT show +4 oxidation state is:
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Electronic configuration of \(Pd^{2+}\) (at.no.46) is
[JEE Main 2023, 31 Jan (Shift 1)]
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Given below are two statement: one is labelled as Assertion (A) and the other is labelled as Reason (R)
Assertion (A): \(5 f\) electrons can participate in bonding to a far greater extent than 4 f electrons
Reason (R): \(5 f\) orbitals are not as buried as \(4 f\) orbitals
In the light of the above statements, choose the correct answer from the options given below:
[JEE Main 2023, 12 Apr (Shift 1)]
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Given below are two statements:
Statement-I: Nickel is being used as the catalyst for producing syn gas and edible fats.
Statement-II: Silicon forms both electron rich and electron deficient hydrides.
In the light of the above statements, choose the most appropriate answer from the options given below:
[JEE Main 2023, 29 Jan (Shift 2)]
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\(Fex _2\) and \(Fey _3\) are known when \(x\) and \(y\) are:
[JEE Main 2021, 16 Mar (Shift 2)]
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Given below are two statements:
Statement -I: In the Lanthanoids, the formation of Ce+4 is favoured by its noble gas configuration.
Statement-II: Ce+4 is a strong oxidant reverting to the common +3 state.
In the light of the above statements, choose the most appropriate answer from the options given below:
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Given below are two statements :
Statement (I) : The metallic radius of Al is less than that of Ga.
Statement (II) : The ionic radius of \({\mathrm{Al}}^{3+}\) is less than that of \({\mathrm{Ga}}^{3+}\).
In the light of the above statements, choose the most appropriate answer from the options given below :
[JEE Main 2025, 2 Apr (Shift 1)]
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On treating a compound with warm dil. \(H _2 SO _4\), gas X is evolved which turns \(K _2 Cr _2 O _7\) paper acidified with dil. \(H _2 SO _4\) to a green compound Y. X and Y respectively are:
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In the laboratory, manganese (II) salt is oxidised to permanganate ion in aqueous solution by
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The atomic radius of Ag is closest to
[JEE Main 2020, 7 Jan (Shift 1)]
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Which one of the following when dissolved in water gives coloured solution in nitrogen atmosphere?
[JEE Main 2021, 26 Aug (Shift 1)]
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The sum of oxidation state of the metals in \(Fe ( CO )_5, VO ^{2+}\) and \(WO _3\) is ______
[JEE Main 2023, 8 Apr (Shift 2)]
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In chromyl chloride, the number of d-electrons present on chromium is same as in (Given at no. of Ti : 22, \(V : 23, Cr : 24, Mn : 25, Fe : 26)\)
[JEE Main 2023, 8 Apr (Shift 1)]
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The spin only magnetic moment of a divalent ion in aqueous solution (atomic number 29) is................BM (nearest integer)
[JEE Main 2021, 25 Feb (Shift 2)]
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Which one amongst the following are good oxidizing agents?
A. \(Sm ^{2+}\)
B. \(Ce ^{2+}\)
C. \(Ce ^{4+}\)
D. \(Tb ^{4+}\)
Choose the most appropriate answer from the options given below:
[JEE Main 2023, 24 Jan (Shift 2)]
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Statement-I: The \(\mathrm{E ^{\circ}}\) value for \(\mathrm{Ce ^{4+} / Ce ^{3+}}\) is \(\mathrm{+1.74 V}\).
Statement-II: \(\mathrm{Ce}\) is more stable in \(\mathrm{Ce ^{4+}}\) state than \(\mathrm{Ce ^{3+}}\) state.
[JEE Main 2021, 16 Mar (Shift 1)]
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Identify the element for which electronic configuration in +3 oxidation state is \( [\mathrm{Ar}] 3 \mathrm{d}^{5} \)
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In chromyl chloride, the number of d-electrons present on chromium is same as in (Given atomic no. of Ti : 22, \(V : 23, Cr : 24, Mn : 25, Fe : 26)\)
[JEE Main 2023, 8 Apr (Shift 1)]
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The addition of dilute NaOH to \({\mathrm{Cr}}^{3+}\) salt solution will give:
[JEE Main 2021, 27 Aug (Shift 2)]
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The incorrect statement is:
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The nature of oxides \(V _2 O _3\) and \(CrO\) is indexed as ' \(X\) ' and ' \(Y\) ' type respectively. The correct set of \(X\) and \(Y\) is:
[JEE Main 2021, 27 Aug (Shift 1)]
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Prolonged heating is avoided during the preparation of ferrous ammonium sulphate to
[JEE Main 2023, 10 Apr (Shift 1)]
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The set having ions which are coloured and paramagnetic both is:
[JEE Main 2021, 22 Jul (Shift 2)]
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Consider the sulphides \(HgS , PbS , CuS , Sb _2 S _3, As _2 S _3\) and CdS. Number of these sulphides soluble in \(50 \% ~HNO _3\) is____
[JEE Main 2021, 31 Aug (Shift 1)]
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The magnetic moment of a transition metal compound has been calculated to be \(3.87\) BM. The metal ion is
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Given below are two statements:
Statement -I: In the Lanthanoids, the formation of Ce+4 is favoured by its noble gas configuration.
Statement-II: Ce+4 is a strong oxidant reverting to the common +3 state.
In the light of the above statements, choose the most appropriate answer from the options given below:
[JEE Main 2024, 27 Jan (Shift 2)]
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The correct electronic configuration and spin only magnetic moment \(( BM )\) of \(Gd ^{3+}( Z =64)\), respectively, are:
[JEE Main 2020, 5 Sep (Shift 1)]
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Given below are two statements
Statement-I : Aqueous solution of \(K _2 Cr _2 O _7\) is preferred as a primary standard in volumetric analysis over \(Na _2 Cr _2 O _7\) aqueous solution.
Statement-II : \(K _2 Cr _2 O _7\) has a higher solubility in water than \(Na _2 Cr _2 O _7\)
In the light of the above statements, choose the correct answer from the options given below:
[JEE Main 2023, 10 Apr (Shift 1)]
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Which of the following statements are correct?
(A) The \(M ^{3+} / M ^{2+}\) reduction potential for iron is greater than manganese
(B) The higher oxidation states of first row d-block elements get stabilized by oxide ion.
(C) Aqueous solution of \(Cr ^{2+}\) can liberate hydrogen from dilute acid.
(D) Magnetic moment of \(V ^{2+}\) is observed between 4.4-5.2 BM
Choose the correct answer from the options given below:
[JEE Main 2023, 10 Apr (Shift 1)]
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Number of electrons present in \(4 f\) orbital of \(Ho ^{3+}\) ion is________ . (Given atomic number of \(Ho =67)\)
[JEE Main 2021, 25 Jul (Shift 2)]
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The number of \( 4 f \) electrons in the ground state electronic configuration of \( \mathrm{Gd}^{2+} \) is.........
[JEE Main 2021, 26 Aug (Shift 1)]
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Identify the element for which electronic configuration in +3 oxidation state is \( [\mathrm{Ar}] 3 \mathrm{d}^{5} \)
[JEE Main 2021, 1 Sep (Shift 2)]
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During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value of 3. Identify which of the below medium will favour the reaction
[JEE Main 2023, 6 Apr (Shift 2)]
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Potassium permanganate on heating at \( 513 \mathrm{~K} \) gives a product which is
[JEE Main 2021, 27 Aug (Shift 2)]
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Strong reducing and oxidizing agents among the following, respectively, are
[JEE Main 2023, 6 Apr (Shift 1)]
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The incorrect statement is:
[JEE Main 2020, 6 Sep (Shift 1)]
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In neutral or alkaline solution, \(MnO _4^{-}\) oxidizes thiosulphate to:
[JEE Main 2022, 27 Jul (Shift 2)]
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The common positive oxidation states for an element with atomic number 24 , are:
[JEE Main 2021, 17 Mar (Shift 2)]
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In mildly alkaline medium, thiosulphate ion is oxidized by \( \mathrm{MnO}_{4}^{-} \)to \( A \). The oxidation state of sulphur in A is
[JEE Main 2021, 26 Feb (Shift 2)]
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Arrange the following metal complex/compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin system.
(Atomic numbers \(Ce =58, Gd =64\) and \(Eu =63\).)
A. \(\left( NH _4\right)_2\left[ Ce \left( NO _3\right)_6\right]\)
B. \(Gd \left( NO _3\right)_3\) and
C. \(Eu \left( NO _3\right)_3\)
Answer is:
[JEE Main 2021, 16 Mar (Shift 2)]
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\(H _2 S\) ( 5 moles) reacts completely with acidified aqueous potassium permanganate solution. In this reaction, the number of moles of water produced is \(x\), and the number of moles of electrons involved is \(y\). The value of \((x+y)\) is___________
[JEE Advanced 2023, Paper-2]
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The electrode potential of \(M^{2 +}/M\) of \(3\ d\) - series elements shows positive value for
[JEE Main 2021, 24 Feb (Shift 1)]
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On treating a compound with warm dil. \(H _2 SO _4\), gas X is evolved which turns \(K _2 Cr _2 O _7\) paper acidified with dil. \(H _2 SO _4\) to a green compound Y. X and Y respectively are:
[JEE Main 2021, 26 Feb (Shift 1)]
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Consider the following reactions:
\( \mathrm{NaCl}+\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}+\mathrm{H}_{2} \mathrm{SO}_{4} \rightarrow(\mathrm{A})+ \) side products (conc.)
(A) \( +\mathrm{NaOH} \rightarrow(\mathrm{B})+ \) Side products
(B) \( +\mathrm{H}_{2} \mathrm{SO}_{4}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow(\mathrm{C})+ \) Side products (dilute)
The sum of the total number of atoms in one moelcule each of \( (A),(B) \) and \( (C) \) is ____.
[JEE Main 2020, 7 Jan (Shift 2)]
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\(\mathrm{Cu} ^{2+}\) salt reacts with potassium iodide to give:
[JEE Main 2021, 20 Jul (Shift 2)]
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Which one of the following lanthanides exhibits +2 oxidation state with diamagnetic nature? (Given, Z for Nd = 60, Yb = 70, La = 57, Ce = 58)
[JEE Main 2021, 31 Aug (Shift 1)]
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A colorless aqueous solution contains nitrates of two metals, Xand Y When it was added to an aqueous solution of NaCl, a white precipitate was formed. This precipitate was found to be partly soluble in hot water to give a residue P and a solution Q The residue P was soluble in aq. \(\mathrm{NH}_3\) and also in excess sodium thiosulfate. The hot solution \(\mathbf{Q}\) gave a yellow precipitate with \(\mathrm{KI}\). The metals X and Y, respectively, are
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Dichromate ion is treated with base, the oxidation number of \(Cr\) in the product formed is__________
[JEE Main 2021, 26 Feb (Shift 1)]
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The electronic configurations of bivalent europium and trivalent cerium are :
(atomic number : \( \mathrm{Xe}=54, \mathrm{Ce}=58, \mathrm{Eu}=63 \) )
[JEE Main 2020, 9 Jan (Shift 1)]
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When \(Cu ^{2+}\) ion is treated with \(KI\), a white precipitate, \(X\) appears in solution. The solution is titrated with sodium thiosulphate, the compound \(Y\) is formed. \(X\) and \(Y\) respectively are
[JEE Main 2023, 31 Jan (Shift 1)]
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\(KMnO _4\) is titrated with ferrous ammonium sulphate hexahydrate in presence of dilute \(H _2 SO _4\). Number of water molecules produced for 2 molecules of \(KMnO _4\) is___________
[JEE Main 2023, 13 Apr (Shift 1)]
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Most suitable salt which can be used for efficient clotting of blood will be
[JEE Main 2021, 24 Feb (Shift 2)]
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The total change in the oxidation state of manganese involved in the reaction of \(KMnO _4\) and potassium iodide in the acidic medium is..................
[JEE Main 2023, 15 Apr (Shift 1)]
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Find the total number of correct statements?
(a) Manganate and Permanganate ions are paramagnetic
(b) Manganate and Permanganate ions are tetrahedral
(c) Manganate ion is green in color and Permanganate ion is purple in color
(d) In manganate and permanganate ions, pi-bonding takes place by overlap of p-orbitals of oxygen and d-orbital of manganese
[JEE Main 2020, 3 Sep (Shift 2)]
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\(K _2 Cr _2 O _7\) paper acidified with dilute \(H _2 SO _4\) turns green when exposed to
[JEE Main 2023, 24 Jan (Shift 2)]
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The lanthanoid that does NOT show +4 oxidation state is:
[JEE Main 2020, 6 Sep (Shift 1)]
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