Chemistry-(general)
NEET Chemistry (general) MCQ Question
Type: MCQ-numerical-Easy-Class 12
Which of the following coordination compounds is diamagnetic due to the absence of unpaired electrons in its d-orbitals?
A
[Co(NH3)6]3+
B
[Cr(H2O)6]3+
C
[Fe(CN)6]4-
D
[Ni(CN)4]2-
Correct Answer
Option A
Detailed Explanation
According to the NCERT context, the complex [Co(NH3)6]3+ is diamagnetic because it has no unpaired electrons. The cobalt ion is in +3 oxidation state with a 3d6 configuration, and the electrons pair up in the hybridized orbitals.
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