The D and F-Block Elements

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)]

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)]

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)]

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)]

Which of the following pair of ions are same coloured?

(Memory Based JEE Mains 23/01/2025 ,Shift -1)

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)]

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)]

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)]

The electronic configuration of Einsteinium is :
(Given atomic number of Einsteinium =99)

[JEE Main 2024, 9 Apr (Shift 2)]

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)]

Lanthanoid ions with $4f^7$ 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

Which of the following pair of ions are coloured?

(JEE Mains 23/01/2025, Shift - I, Memory Based )

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)]

The metal that shows highest and maximum number of oxidation state is :

[JEE Main 2024, 5 Apr (Shift 1)]

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)]

Which of the following electronic configuration would be associated with the highest magnetic moment?

[JEE Main 2024, 27 Jan (Shift 1)]

Which has a maximum oxidizing power among the following?

Identity the incorrect pair from the following :

[JEE Main 2024, 27 Jan (Shift 2)]

Identity the incorrect pair from the following :

[JEE Main 2024, 27 Jan (Shift 2)]

Consider the following reactions

${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7\stackrel{\mathrm{KOH}}{\to }\mathrm{A}\stackrel{{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }\mathrm{B}+{\mathrm{K}}_2{\mathrm{SO}}_4$

The products A and B respectively are

[JEE Main 2025, 23 Jan (Shift 2)]

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)]

The transition metal having highest \(3^{\text {rd }}\) ionisation enthalpy is :

[JEE Main 2024, 01 Feb (Shift 2)]

EndFragment

The transition metal having highest \(3^{\text {rd }}\) ionisation enthalpy is :

[JEE Main 2024, 01 Feb (Shift 2)]

EndFragment

${\mathrm{KMnO}}_4$ 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)]

\(\mathrm{KMnO}_{4}\) decomposes on heating at \(513 \mathrm{~K}\) to form \(\mathrm{O}_{2}\) along with

[JEE Main 2024, 29 Jan (Shift 1)]

\(\mathrm{KMnO}_{4}\) decomposes on heating at \(513 \mathrm{~K}\) to form \(\mathrm{O}_{2}\) along with

[JEE Main 2024, 29 Jan (Shift 1)]

The electronic configuration for Neodymium is
[Atomic Number for Neodymium $60$]

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)]

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)

Identity the incorrect pair from the following :

[JEE Main 2024, 27 Jan (Shift 2)]

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)]

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)]

The incorrect relationship in the following pairs in relation to ionisation enthalpies is

[JEE Main 2025, 4 Apr (Shift 2)]

"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

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)]

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)]

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)]

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)]

Which of the following is the strongest oxidising agent ? (Jee mains shift-1 memory based 24/01/2025).

Choose the correct option having all the elements with \(d ^{10}\) electronic configuration from the following :

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

Which has a maximum oxidizing power among the following?

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)]

The electronic configuration for Neodymium is
[Atomic Number for Neodymium $60$]

Which of the following pair of ions are same coloured?

(Memory Based JEE Mains 23/01/2025 ,Shift -1)

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)]

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)]

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)]

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)]

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)]

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

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)]

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)]

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)]

\(A\) 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)]

\(A\) 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)]

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)]

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.

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)]

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)]

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)]

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)]

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)]

The correct set of ions (aqueous solution) with same colour from the following is:

[JEE Main 2025, 23 Jan (Shift 1)]

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)]

One of the products formed from the reaction of permanganate ion with iodide ion in neutral aqueous medium is

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)]

One of the products formed from the reaction of permanganate ion with iodide ion in neutral aqueous medium is

[JEE Advanced 2025, Paper-1]

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)]

"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

Which of the following is the strongest oxidising agent ? (Jee mains shift-1 memory based 24/01/2025).

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)

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)

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)]

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:

The electronic configuration for Neodymium is
[Atomic Number for Neodymium $60$]

[JEE Main 2024, 27 Jan (Shift 1)]

The electronic configuration for Neodymium is
[Atomic Number for Neodymium $60$]

[JEE Main 2024, 27 Jan (Shift 1)]

Which of the following electronic configuration would be associated with the highest magnetic moment?

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)

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)]

Which of the following pair of ions are coloured?

(JEE Mains 23/01/2025, Shift - I, Memory Based )

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)]

The incorrect relationship in the following pairs in relation to ionisation enthalpies is

[JEE Main 2025, 4 Apr (Shift 2)]

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)]

Given below are two statements :
Statement I : ${\mathrm{CrO}}_3$ is a stronger oxidizing agent than ${\mathrm{MoO}}_3$
Statement II : $\mathrm{Cr}\left(\mathrm{VI}\right)$is more stable than $\mathrm{Mo}\left(\mathrm{VI}\right)$
In the light of the above statements, choose the correct answer from the options given below

[JEE Main 2025, 3 Apr (Shift 2)]

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)]

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)]

Which of the following compounds show colour due to d-d transition?EndFragment

[JEE Main 2024, 01 Feb (Shift 2)]

Which of the following compounds show colour due to d-d transition?EndFragment

[JEE Main 2024, 01 Feb (Shift 2)]

In alkaline medium, \(\mathrm{MnO}_{4}^{-}\)oxidises \(\mathrm{I}^{-}\)to

[JEE Main 2024, 29 Jan (Shift 1)]

In alkaline medium, \(\mathrm{MnO}_{4}^{-}\)oxidises \(\mathrm{I}^{-}\)to

[JEE Main 2024, 29 Jan (Shift 1)]