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JEE Main2026Jan 23, Shift 1Chemistry
Q.

The statements that are incorrect about the nickel (II) complex of dimethylglyoxime are :

A. It is red in colour

B. It has a high solubility in water at pH = 9

C. The Ni ion has two unpaired d-electrons

D. The N–Ni–N bond angle is almost close to 90°

E. The complex contains four five-membered metallacycles (metal containing rings)

Choose the correct answer from the options given below :

  1. A

    C and E only

  2. B

    A, D and B only

  3. C

    B, C and E only

  4. D

    C and D only

Solution

Ni(DMG) is the classic rosy-red precipitate used in qualitative analysis. Ni is ; with two DMG ligands it adopts square planar geometry (dsp), so all d-electrons are paired.

(A) Red — True.

(B) High solubility at pH 9 — False: the complex precipitates from basic solution; it is the basis of the gravimetric test.

(C) Two unpaired d-electrons — False: square-planar Ni(II) is diamagnetic, no unpaired electrons.

(D) N–Ni–N — True for square planar geometry.

(E) Four five-membered metallacycles — False: each DMG chelate makes one five-membered ring at Ni, so there are two such rings in total.

Incorrect: B, C and E only.

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