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 :

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

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 :

A. C and E Only

B. A, D and B Only

C. B, C and E Only

D. C and D Only

Correct Answer: B, C and E Only

Explanation

The nickel(II) dimethylglyoxime complex, $Ni(dmg)_2$, is a **classic square planar complex** used for the qualitative detection of nickel.

Statement A is correct. The complex is **red in colour**, which is a well-known characteristic of the nickel dimethylglyoxime precipitate.

Statement B is incorrect. The complex is **insoluble in water**, even in alkaline medium. This low solubility is why it precipitates easily at pH ≈ 9.

Statement C is incorrect. Nickel(II) in this complex undergoes **dsp² hybridisation**, leading to **pairing of electrons**. Hence, the complex is **diamagnetic with zero unpaired electrons**, not two.

Statement D is correct. The complex has a **square planar geometry**, so the **N – Ni – N bond angle is close to 90°**.

Statement E is incorrect. The complex contains **two five-membered chelate rings**, not four. Each dimethylglyoxime ligand forms one five-membered ring with nickel.

Therefore, the incorrect statements are B, C and E.

Explanation

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