A. ‌‌[NiCl4]2−;Ni+2;3d8;sp3 hybridisation; 2 unpaired electrons; paramagnetic B. Ni(CO)4;Ni;3d84s2;sp3 hybridisation; Zero unpaired electron; diamagnetic C. ‌‌[Ni(CN)4]2−;Ni+2;3d8;dsp2 hybridisation; Zero unpaired electron; diamagnetic D. [Ni(H2O)6]2+;Ni2+,3d8;sp3d2 hybridisation; Two unpaired electron; paramagnetic E. ‌‌Ni(PPh3)4; Ni; 3d84s2,sp3 hybridisation; zero unpaired electron; Diamagnetic