There are three unpaired electrons in[Co(H2O)6]2+[Co(H2O)6]2+and calculated value of magnetic moment is 3.87 BM which is quite different from the experimental value of 4.40 BM. This is because of[Co(H2Co(H2O)6]2+and calculated value of magnetic moment is 3.87 BM which is quite different from the experimental value of 4.40 BM. This is because of

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Solution

${[C o (H_{2} O)_{6}]}^{2 +} C o h a s 3 d^{7} 4 s^{2} c o n f i g u r a t i o n C o^{2 +} h a s 3 d^{7} c o n f i g u r a t i o n . T h u s i t h a s 3 u n p a i r e d e l e c t r o n s . S o t h e m a g n e t i c m o m e n t i s \sqrt{3 (3 + 2)} = \sqrt{15} = 3.87 B M$
The difference in magnetic moment is due to orbital contribution along with spin contribution.

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