The magnetic moment for two complexes of empirical formula Ni(NH3)4 (NO3)2.2H2O is zero and 2.84 BM repectively. The second complex is not a neutral complex. The correct formula and geometry of the first complex is :

(1)	[Ni(H2O)2(NO3)2].4NO3 = Tetrahedral
(2)	[Ni(NH3)4] (NO3)2.2H2O = Tetrahedral
(3)	[Ni(NH3)4](NO3)2.2H2O = Square planar
(4)	[Ni(NH3)4(H2O)2](NO3)2 = Octahedral

Ans. Option C

 

No.	Complex	Geometry	Oxidation state	Electronic configuration	Magnetic moment
(1)	[Ni(H2O)2(NO3)2].4NO3	Tetrahedral Sp3	+2	d8 ↑↓ ↑↓ ↑↓ ↑ ↑	2.83
(2)	[Ni(NH3)4] (NO3)2.2H2O	Tetrahedral Sp3	+2	d8 ↑↓ ↑↓ ↑↓ ↑ ↑	2.83
(3)	[Ni(NH3)4](NO3)2.2H2O	Square planar dsp2	+2	d8 ↑↓ ↑↓ ↑↓ ↑↓	0
(4)	[Ni(NH3)4(H2O)2](NO3)2	Octahedral Sp3d2	+2	d8 ↑↓ ↑↓ ↑↓ ↑ ↑	2.83