The D and F-Block Elements

Q1 FREE PREVIEW

PYQ

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

(A) and (B) only

b

(B) and (C) only

c

(A) and (D) only

d

(B) and (E) only

✓ Correct answer: a)

(A) and (B) only

Explanation

\(E{u}^{2+}:[Xe]4{f}^{7}6{s}^{0}\\ G{d}^{3+}:[Xe]4{f}^{7}5{d}^{0}6{s}^{0}\\ E{u}^{3+}:[Xe]4{f}^{6}6{s}^{0}\\ T{b}^{3+}:[Xe]4{f}^{8}6{s}^{0}\\ S{m}^{2+}:[Xe]4{f}^{6}6{s}^{0}\)

Hence, only \(E{u}^{2+}\) and \(G{d}^{3+}\) have \(4{f}^{7}\) configuration.

Q2 FREE PREVIEW

PYQ

Which of the following pair of ions are coloured?

a

\({\mathrm{Ti}}^{4+},{\mathrm{V}}^{3+}\)

b

\({\mathrm{Cr}}^{2+},{\mathrm{Cu}}^{2+}\)

c

\({\mathrm{Cr}}^{3+},{\mathrm{Ni}}^{2+}\)

d

\({\mathrm{Mn}}^{3+},{\mathrm{Ni}}^{2+}\)

✓ Correct answer: b)

\({\mathrm{Cr}}^{2+},{\mathrm{Cu}}^{2+}\)

Explanation

\({\mathrm{Cr}}^{2+},{\mathrm{Cu}}^{2+},\)both are blue in colour.

Q3 FREE PREVIEW

PYQ

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

a

+4 and +1

b

+2 and +3

c

+4 and +3

d

+1 and +4

✓ Correct answer: b)

+2 and +3

Explanation

The ionization energy depends upon the size and effective nuclear charge. when we move down the group I.E decreases and across the period the I.E increases.

The order of I.E is given as Pb>Tl >Al>In (Tl has more I.E than Al due to poor shielding of f orbital electrons)

The most stable oxidation state of Pb is +2, due to the inert pair effect, and In has a stable oxidation state is +3 .

Q4

PYQ

'Spin only' magnetic moment is same for which of the following ions?

\(A.{\mathrm{Ti}}^{3+}\\ B.{\mathrm{Cr}}^{2+}\\ C.{\mathrm{Mn}}^{2+}\\ D.{\mathrm{Fe}}^{2+}\\ E.{\mathrm{Sc}}^{3+}\)

Choose the most appropriate answer from the options given below:

a

A and D only

b

B and D only

c

A and E only

d

B and C only

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Q5

PYQ

Which has a maximum oxidizing power among the following?

a

\({{\mathrm{VO}}_{2}}^{+}\)

b

\({\mathrm{Cr}}_{2}{{\mathrm{O}}_{7}}^{2-}\)

c

\({{\mathrm{MnO}}_{4}}^{-}\)

d

\({\mathrm{TiO}}_{2}\)

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Q6

PYQ

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)

a

\({\mathrm{KMnO}}_{4}\)

b

\({\mathrm{K}}_{2}{\mathrm{MnO}}_{4}\)

c

\(\mathrm{MnO}\)

d

\({\mathrm{Mn}}_{3}{\mathrm{O}}_{4}\)

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Q7

PYQ

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)

a

\({\mathrm{KMnO}}_{4}\)

b

\({\mathrm{K}}_{2}{\mathrm{MnO}}_{4}\)

c

\(\mathrm{MnO}\)

d

\({\mathrm{Mn}}_{3}{\mathrm{O}}_{4}\)

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Q8

PYQ

Which of the following lanthanide ion has 7 electrons in its outer shell?

(Memory Based JEE Mains 22/01/2025 Shift-1)

a

\({\mathrm{Eu}}^{+3}\)

b

\({\mathrm{Gd}}^{+3}\)

c

\({\mathrm{Sm}}^{2+}\)

d

\({\mathrm{Gd}}^{+2}\)

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Q9

PYQ

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:

a

C, D and E Only

b

A, B and C Only

c

B, C and D Only

d

A, D and E Only

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Q10

PYQ

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)]

a

\({K}_{2}Mn{O}_{4}\)

b

\(KMn{O}_{4}\)

c

\({K}_{3}Mn{O}_{4}\)

d

\({K}_{4}\left[Mn(OH{)}_{6}\right]\)

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Q11

PYQ

Which of the following set of ions act as oxidising agents?

[Re-NEET 2024]

a

\(Ce ^{4+}\) and \(Tb ^{4+}\)

b

\(La ^{3+}\) and \(Lu ^{3+}\)

c

\(Eu ^{2+}\) and \(Yb ^{2+}\)

d

\(Eu ^{2+}\) and \(Tb ^{4+}\)

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Q12

PYQ

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)]

a

\(T{b}^{4+}\)

b

\(L{u}^{3+}\)

c

\(E{u}^{2+}\)

d

\(C{e}^{3+}\)

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Q13

PYQ

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)]

a

+4

b

+7

c

+3

d

+5

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Q14

PYQ

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)]

a

B and C Only

b

A and C Only

c

B and D Only

d

A, D and E Only

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Q15

PYQ

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

[JEE Advanced 2025, Paper-1]

a

\({\mathrm{I}}_{2}\)

b

\({\mathrm{IO}}_{3}^{-}\)

c

\({\mathrm{IO}}_{4}^{-}\)

d

\({\mathrm{IO}}_{2}^{-}\)

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Q16

PYQ

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)

a

0

b

2

c

3

d

4

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Q17

PYQ

The pair of lanthanoid ions which are diamagnetic is

[NEET 2024]

a

\(P{m}^{3+}\) and \(S{m}^{3+}\)

b

\(C{e}^{4+}\) and \(Y{b}^{2+}\)

c

\(C{e}^{3+}\) and \(E{u}^{2+}\)

d

\(G{d}^{3+}\)and \(E{u}^{3+}\)

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Q18

PYQ

Which of the following lanthanide ion has 7 electrons in its outer shell?

(Memory Based JEE Mains 22/01/2025 Shift-1)

a

\({\mathrm{Eu}}^{+3}\)

b

\({\mathrm{Gd}}^{+3}\)

c

\({\mathrm{Sm}}^{2+}\)

d

\({\mathrm{Gd}}^{+2}\)

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Q19

PYQ

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

a

\([ Ar ] 3 d ^7\)

b

\([ Ar ] 3 d ^3\)

c

\([ Ar ] 3 d ^8\)

d

\([ Ar ] 3 d ^6\)

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Q20

PYQ

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)]

a

\({\mathrm{K}}_{2}{\mathrm{CrO}}_{4}\mathrm{and}{\mathrm{K}}_{2}{\mathrm{Cr}}_{2}{\mathrm{O}}_{7}\)

b

\({\mathrm{K}}_{2}\mathrm{Cr}{\left(\mathrm{OH}\right)}_{6}\mathrm{and}{\mathrm{Cr}}_{2}{\mathrm{O}}_{3}\)

c

\({\mathrm{K}}_{2}{\mathrm{CrO}}_{4}\mathrm{and}{\mathrm{Cr}}_{2}{\mathrm{O}}_{3}\)

d

\({\mathrm{K}}_{2}{\mathrm{CrO}}_{4}\mathrm{and}\mathrm{CrO}\)

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Q21

PYQ

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

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

a

\({\mathrm{Zn}}^{2+},{\mathrm{V}}^{3+},{\mathrm{Fe}}^{3+}\)

b

\({\mathrm{Sc}}^{3+},{\mathrm{Ti}}^{3+},{\mathrm{Cr}}^{2+}\)

c

\({\mathrm{Ti}}^{4+},{\mathrm{V}}^{4+},{\mathrm{Mn}}^{2+}\)

d

\({\mathrm{V}}^{2+},{\mathrm{Cr}}^{3+},{\mathrm{Mn}}^{3+}\)

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Q22

PYQ

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)

a

Pd

b

Ir

c

Pt

d

Os

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Q23

PYQ

Which of the following pair of ions are same coloured?

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

a

\({\mathrm{Ti}}^{4+},{\mathrm{V}}^{3+}\)

b

\({\mathrm{Cr}}^{2+},{\mathrm{Cu}}^{2+}\)

c

\({\mathrm{Cr}}^{3+},{\mathrm{Ni}}^{2+}\)

d

\({\mathrm{Mn}}^{3+},{\mathrm{Ni}}^{2+}\)

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Q24

PYQ

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

a

\({\mathrm{Eu}}^{+2}\)

b

\({\mathrm{Ce}}^{+2}\)

c

\({\mathrm{Ce}}^{+4}\)

d

\({\mathrm{Eu}}^{4+}\)

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Q25

PYQ

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)

a

\({\mathrm{KMnO}}_{4}\)

b

\({\mathrm{K}}_{2}{\mathrm{MnO}}_{4}\)

c

\(\mathrm{MnO}\)

d

\({\mathrm{Mn}}_{3}{\mathrm{O}}_{4}\)

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Q26

PYQ

The electronic configurations of bivalent europium and trivalent cerium are :

(atomic number : \( \mathrm{Xe}=54, \mathrm{Ce}=58, \mathrm{Eu}=63 \) )

a

\( [\mathrm{Xe}] 4 \mathrm{f}^{4} \) and \( [\mathrm{Xe}] 4 \mathrm{f}^{9} \)

b

\( [\mathrm{Xe}] 4 \mathrm{f}^{7} \) and \( [\mathrm{Xe}] 4 \mathrm{f}^{1} \)

c

\( [\mathrm{Xe}] 4 \mathrm{f}^{7} 6 \mathrm{~s}^{2} \) and \( [\mathrm{Xe}] 4 \mathrm{f}^{2} 6 \mathrm{s}^{2} \)

d

\( [\mathrm{Xe}] 4 \mathrm{f}^{2} \) and \( [\mathrm{Xe}] 4 \mathrm{f}^{7} \)

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