Question

Amongst the following ions which one has the highest magnetic moment value? (i) [Cr(H2O)6] 3+ (ii) [Fe(H2O)6] 2+ (iii) [Zn(H2O)6] 2+

Answer 1

 [Fe(H2O)6] 2+
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Option B) has highest magnetic moment .

Reason -
  Formula → Magnetic moment = μ = √n (n + 2)
                      (where n is number of unpaired electrons )

Now No. of unpaired electrons are -
[Cr(H2O)6] 3+  →3  , Magnetic moment = 3.87 BM
[Fe(H2O)6] 2+ →4   , Magnetic moment = 4.89 BM
[Zn(H2O)6] 2+ →0   , Magnetic moment = 0

Hope it will help u ....
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Best of luck ;)
ROYALJATT

Answer 2

Let's count the no. of unpaired electrons!

In:
(i) 3
(ii) 4
(iii) 0 

Magnetic moment is given of (ii) as √n (n+2)

∴ Its directly proportional to no of unpaired electrons. 

So, Ans is (ii).