question_answer

Which of the following complexes are low spin and diamagnetic?

(1) \[{{K}_{4}}[Os{{(CN)}_{6}}]\]

(2) \[[Mo{{(CO)}_{6}}]\]

(3) \[{{[Mn{{(CN)}_{6}}]}^{4-}}\]

Select the correct answer using the codes given below.

A)  1, 2 and 3

B)  1 and 2 only

C)  1 and 3 only

D)  2 and 3

Correct Answer: B

Solution :

All are low spin complexes but (3) has one unpaired electron so it is diamagnetic.