There are four complexes of Ni. Select the complexes/es which will be attracted by magnetic field: (I) N i C N 4 2 - (II) N i C l 4 2 - (III) N i C O 4 (IV) N i N H 3 6 2 +

Step-by-step solution

Only N i C l 4 2 - and N i N H 3 6 2 + are paramagnetic so will be attracted in magnetic field. Complex O.S HBZ Geometry Unpaired Magnetic property N i C l 4 2 - +2 s p 3 Tetrahadral 2 Paramagnetic N i C N 4 2 - +2 d s p 2 Square planar 0 Diamagnetic N i C O 4 0 s p 3 Tetrahadral 0 Diamagnetic N i N H 3 6 2 + +2 s p 3 d 2 Octahedral 2 Paramagnetic