D-And F-Block Elements Ques 323

Question: Which of the following ions has the least magnetic moment

[MP PMT 1993]

Options:

A) $ C{{u}^{+2}} $

B) $ N{{i}^{+2}} $

C) $ C{{o}^{+3}} $

D) $ F{{e}^{+2}} $

Show Answer

Answer:

Correct Answer: A

Solution:

S.No Ion Electronic configuration No. of unpaired electrons
(i) $ C{{u}^{+2}} $ $ d^{9} $ 1
(ii) $ N{{i}^{+2}} $ $ d^{8} $ 2
(iii) $ C{{o}^{+2}} $ $ d^{7} $ 3
(iv) $ F{{e}^{+2}} $ $ d^{6} $ 4

$ \mu =\sqrt{n(n+2)} $ (magnetic moment) $ \mu \propto \sqrt{n} $

$ C{{u}^{+2}} $ there is only 1 unpaired electron so its magnetic moment is least.



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