Match List I with List II, Coordination Compounds-11

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Solution

Q.
Match List I with List II [2024]

LIST I (Complex ion) LIST II (Electronic Configuration)

A. ${[Cr {(H_{2} O)}_{6}]}^{3 +}$ I. $t_{2 g}^{2} e_{g}^{0}$

B. ${[Fe(H_{2} O)_{6}]}^{3 +}$ II. $t_{2 g}^{3} e_{g}^{0}$

C. ${[Ni(H_{2} O)_{6}]}^{2 +}$ III. $t_{2 g}^{3} e_{g}^{2}$

D. ${[V(H_{2} O)_{6}]}^{3 +}$ IV. $t_{2 g}^{6} e_{g}^{2}$

Choose the correct answer from the options given below:

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

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

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

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

Ans.
(2)

(A) ${[Cr {(H_{2} O)}_{6}]}^{3 +}$

Oxidation number of Cr = +3

${Cr}^{3 +} = {}_{18}{[Ar] 3 d^{3}}$

$d^{3}$ complexes are always split into $t_{2 g}^{3}, e_{g}^{0}$ configuration irrespective of the field strength of the ligand.

(B) ${[Fe {(H ₂ O)}_{6}]}^{3 +}$

The oxidation number of Fe = +3

${Fe}^{3 +} = {}_{18}{[Ar] 3 d^{5}}$

As $H_{2} O$ is a weak field ligand, splitting energy $(Δ ₀)$ is less than pairing energy (P). $E . C = t_{2 g}^{3} e_{g}^{2}$

(C) ${[Ni {(H_{2} O)}_{6}]}^{2 +}$

Oxidation number of Ni = +2

${Ni}^{2 +} = {}_{18}{[Ar] 3 d^{8}}$

Irrespective of the ligand $d^{8}$ complexes always split into $t_{2 g}^{6}, e_{g}^{2}$

(D) ${[V(H_{2} O)_{6}]}^{3 +}$

Oxidation number of V = +3

$V^{3 +} = {}_{18}{[Ar] 3 d^{2}}$

$d^{2}$ complexes are always split into $t_{2 g}^{2}, e_{g}^{0}$ configuration irrespective of field strength of the ligand.

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