Match List I with List II LIST – I (Complex ion) LIST – II (Electronic Configuration A. ${[Cr{({H}_{2}O)}_{6}]}^{3+}$ I. ${t}_{2g}^{2}{e}_{g}^{0}$ B. ${[Fe{({H}_{2}O)}_{6}]}^{3+}$ II. ${t}_{2g}^{3}{e}_{g}^{0}$ C. ${[Ni{({H}_{2}O)}_{6}]}^{2+}$ III. ${t}_{2g}^{3}{e}_{g}^{2}$ D. ${[V{({H}_{2}O)}_{6}]}^{3+}$ IV. ${t}_{2g}^{6}{e}_{g}^{2}$ Choose the correct answer from the options given below :

JEE Main 2024 — Chemistry Inorganic Chemistry

2024mcqhard

Match List I with List II

	LIST – I (Complex ion)		LIST – II (Electronic Configuration
A.	${[Cr{({H}_{2}O)}_{6}]}^{3+}$	I.	${t}_{2g}^{2}{e}_{g}^{0}$
B.	${[Fe{({H}_{2}O)}_{6}]}^{3+}$	II.	${t}_{2g}^{3}{e}_{g}^{0}$
C.	${[Ni{({H}_{2}O)}_{6}]}^{2+}$	III.	${t}_{2g}^{3}{e}_{g}^{2}$
D.	${[V{({H}_{2}O)}_{6}]}^{3+}$	IV.	${t}_{2g}^{6}{e}_{g}^{2}$

Choose the correct answer from the options given below :

Official previous-year question

Held on 31 Jan 2024 · Verified 6 Jul 2026.

Options

A
A-III, B-II, C-IV, D-I
B
A-IV, B-I, C-II, D-III
C
A-IV, B-III, C-I, D-II
D
A-II, B-III, C-IV, D-I

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Solution

The ${t}_{2g}$ (triplet, lower energy) orbitals are the ${d}_{\mathrm{xy}},{d}_{\mathrm{xz}}$ and ${d}_{\mathrm{yz}}$ orbitals. The ${e}_{g}$ (doublet, higher energy) orbitals are the ${d}_{{z}^{2}}$ and ${d}_{{x}^{2}-{y}^{2}}$ orbitals. These split d-orbitals are called ${t}_{2g}$ and ${e}_{g}$ because they are split by the effect of the surrounding ligand ions in a crystal field.

${[\mathrm{Cr}{({H}_{2}O)}_{6}]}^{3+}$ Contains ${\mathrm{Cr}}^{3+}:[\mathrm{Ar}]3{d}^{3}:{t}_{2g}^{3}{e}_{g}^{o}$

${[\mathrm{Fe}{({H}_{2}O)}_{6}]}^{3+}$ Contains ${\mathrm{Fe}}^{3+}:[\mathrm{Ar}]3{d}^{5}:{t}_{2g}^{3}{e}_{g}^{2}$

${[\mathrm{Ni}{({H}_{2}O)}_{6}]}^{2+}$ Contains ${\mathrm{Ni}}^{2+}:[\mathrm{Ar}]3{d}^{8}:{t}_{2g}^{6}{e}_{g}^{2}$

${[V{({H}_{2}O)}_{6}]}^{3+}$ Contains ${V}^{3+}:[\mathrm{Ar}]3{d}^{2}:{t}_{2g}^{2}{e}_{g}^{o}$

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Solution

${[\mathrm{Cr}{({H}_{2}O)}_{6}]}^{3+}$ Contains ${\mathrm{Cr}}^{3+}:[\mathrm{Ar}]3{d}^{3}:{t}_{2g}^{3}{e}_{g}^{o}$

${[\mathrm{Fe}{({H}_{2}O)}_{6}]}^{3+}$ Contains ${\mathrm{Fe}}^{3+}:[\mathrm{Ar}]3{d}^{5}:{t}_{2g}^{3}{e}_{g}^{2}$

${[\mathrm{Ni}{({H}_{2}O)}_{6}]}^{2+}$ Contains ${\mathrm{Ni}}^{2+}:[\mathrm{Ar}]3{d}^{8}:{t}_{2g}^{6}{e}_{g}^{2}$

${[V{({H}_{2}O)}_{6}]}^{3+}$ Contains ${V}^{3+}:[\mathrm{Ar}]3{d}^{2}:{t}_{2g}^{2}{e}_{g}^{o}$

JEE Main 2024 — Chemistry Inorganic Chemistry

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