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Chemistry Co-ordinatios Compounds NTA Abhiyas Question Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

Among the following complexes (K - P), which of the following are diamagnetic?

K 3 [Fe(CN) 6 ] (K), [Co (NH 3 ) 6 ]C1 3 (L),

Na 3 [Co (oxalate) 3 ] (M), [Ni (H 2 O) 6 ]C1 2 (N),

K 2 [Pt (CN) 4 ] (O) and [Zn (H 2 O) 6 ] (NO 3 ) 2 (P)

K, M, O, P

K, L, M, N

L, M, N, O

L, M, O, P

Text Solution

Verified by Experts

The correct answer is:

Following compounds are diamagnetic as in them metal ion has no unpaired electron. L:[Co(NH 3 ) 6 ]Cl 3

M:Na 3 [Co(Ox) 3 ]

O:K 2 [Pt(CN) 4 ]

P:[Zn(H 2 O) 6 ](NO 3 ) 2

In L, M, O inner d-electrons get paired while in P Zn has already 3d 10 configuration.

In K and N there are 1 and 2 unpaired electrons respectively so they are paramagnetic.

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