D-And F-Block Elements Ques 323

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

[MP PMT 1993]

Options:

A) Cu+2

B) Ni+2

C) Co+3

D) Fe+2

Show Answer

Answer:

Correct Answer: A

Solution:

S.No Ion Electronic configuration No. of unpaired electrons
(i) Cu+2 d9 1
(ii) Ni+2 d8 2
(iii) Co+2 d7 3
(iv) Fe+2 d6 4

μ=n(n+2) (magnetic moment) μn

Cu+2 there is only 1 unpaired electron so its magnetic moment is least.



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