Which of the following statement is not correct ?
(a) `[Ni(H_(2)O)_(6)]^(2+)` and `[Ni(NH_(3))_(6)]^(2+)` have same value of CFSE
( b) `[Ni(H_(2)O)_(6)]^(2+)` and `[Ni(NH_(3))_(6)]^(2+)` have same value of magnetic moment

Options

A. Only a
B. Only b
C. Both a and b
D. None of these

Answer

A

Explanation

(a) Ammonia is a stronger field ligand than water. So `[Ni(NH_(3))_(6)]^(2+)` will have higher CFSE than `[Ni(H_(2)O)_(6)]^(2+)`.
(b). Both complexes `[Ni(H_(2)O)_(6)]^(2+)` and `[Ni(NH_(3))_(6)]^(2+)` have `sp^(3)d^(2)` hybridisation with two unpaired electrons. So, they possess same magnetic momen (' spin only ')