NEET 2022 — Chemistry solution

NEET2022Chemistry

The order of energy absorbed which is responsible for the color of complexes

(A) [Ni(H $_{2}$ O) $_{2}$ (en) $_{2}$ ] $^{2 +}$

(B) [Ni(H $_{2}$ O) $_{4}$ (en)] $^{2 +}$ and

A
(C) $>$ (B) $>$ (A)
B
(C) $>$ (A) $>$ (B)
C
(B) $>$ (A) $>$ (C)
D
(A) $>$ (B) $>$ (C)

Solution

Ethylenediamine (en) is a stronger field ligand than water in the spectrochemical series, so each additional en in place of H $_{2}$ O increases the crystal field splitting $Δ_{o}$ .

Number of en ligands: (A) has 2, (B) has 1, (C) has 3.

Larger $Δ_{o}$ means the d-d transition absorbs higher energy light. So energy absorbed follows (C) $>$ (A) $>$ (B).

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