Home Chemistry Co-ordinatios Compounds General Which of the following pairs will show the s…
Chemistry Co-ordinatios Compounds General Single Correct MCQ
Published on: August 12, 2026

Which of the following pairs will show the same magnetic moment (‘spin only’)?

A
[Cr(H 2 O) 6 ] 3+ and [Fe(H 2 O) 5 NO] 2+
B
[Mn(CN) 6 ] 4– and [Fe(CN) 6 ] 3–
C
[Ni(CO) 4 ] and [Zn(NH 3 ) 4 ] 2+
D
All of these.

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Text Solution

Verified by Experts
The correct answer is:
D

Cr 3+ , 3d 3 ; sp 3 d 2 hybridisation with three unpaired electrons (weak field as well as strong field ligand).

Fe + , 3d 7 ; sp 3 d 2 hybridisation with three unpaired electron (one 4s electron jumps to 3d orbital for the pairing)

Mn 2+ , 3d 5 ; d 2 sp 3 hybridisation with one unpaired electron after pairing (CN – is strong field ligand).

Fe 3+ , 3d 5 ; d 2 sp 3 hybridisation with one unpaired electron after pairing (CN – is strong field ligand).

Ni, 3d 8 4s 2 ; sp 3 hybridisation and all electrons are paired because CO is strong field ligand (4s-electrons jumps to 3d-orbitals for the pairing)

Zn 2+ , 3d 10 ; sp 3 hybridisation and all electrons are paired.

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