NEET 2025 — Chemistry solution

NEET2025Chemistry

Which of the following are paramagnetic?

A. [NiCl $_{4}$ ] $^{2 -}$ B. Ni(CO) $_{4}$

C. [Ni(CN) $_{4}$ ] $^{2 -}$ D. [Ni(H $_{2}$ O) $_{6}$ ] $^{2 +}$

E. Ni(PPh $_{3}$ ) $_{4}$

Choose the correct answer from the options given below:

A
A and C only
B
B and E only
C
A and D only
D
A, D and E only

Solution

[NiCl $_{4}$ ] $^{2 -}$ : Ni $^{2 +}$ ( $3 d^{8}$ ), Cl $^{-}$ is a weak field ligand (no pairing) — tetrahedral with 2 unpaired electrons → paramagnetic.

[Ni(H $_{2}$ O) $_{6}$ ] $^{2 +}$ : Ni $^{2 +}$ ( $3 d^{8}$ ), H $_{2}$ O is a weak field ligand — octahedral with 2 unpaired electrons → paramagnetic.

Ni(CO) $_{4}$ , [Ni(CN) $_{4}$ ] $^{2 -}$ and Ni(PPh $_{3}$ ) $_{4}$ involve strong field ligands that cause pairing of $d$ electrons → diamagnetic.

$∴$ Only A and D are paramagnetic.

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