Coordination CompoundHard

Question

Which of the following complexes are low spin and diamagnetic ?
(1) K4[Os(CN)6]    (2) [Mo(CO)6]    (3) [Mn(CN)6]4-
Select the correct answer using the codes given below.

Options

A.1, 2 and 3
B.1 and 2 only
C.1 and 3 only
D.2 and 3 only

Solution

All are low spin complexes but (3) has one unpaired electron so it is diamagnetic.
Mn2+, [Ar] 3d5
[Mn(CN)6]4-

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