There are four complexes of Ni. Select the complex(es) which will be attracted by magnetic field: (I) Ni(CN)42−     (II) NiCl42− (iii) NiCO4 (iv) NiH2O62+

Paramagnetic complex will be attracted by magnetic field.Diamagnetic complexes will be repelled by magnetic field. Ni(CN)42−    →0 unpaired electron. NiCl42−    →2 unpaired electron. Ni(CO)4    →0 unpaired electron. NiH2O62+    →2 unpaired electron.