Q. Which of the following are paramagnetic? A. $[NiCl_4]^{2-}$ B. $Ni(CO)_4$ C. $[Ni(CN)_4]^{2-}$ D. $[Ni(H_2O)_6]^{2+}$ E. $Ni(PPh_3)_4$ Choose the correct answer from the options given below:
A) A and C only
B) B and E only
C) A and D only
D) A, D and E only
Explanation
[Solution by Claude - not from source] $[NiCl_4]^{2-}$: $Ni^{2+}$ $d^8$, tetrahedral, 2 unpaired e$^-$ (para). $Ni(CO)_4$: $Ni(0)$ $d^{10}$ (dia). $[Ni(CN)_4]^{2-}$: square planar (dia). $[Ni(H_2O)_6]^{2+}$: octahedral $d^8$, 2 unpaired (para). $Ni(PPh_3)_4$: $d^{10}$ (dia). So A and D. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.