Question bank/NEET UG/Chemistry

NEET UGChemistryModerateNEET 2025

Which of the following are paramagnetic?
A. [NiCl4]2−[\text{NiCl}_4]^{2-}
B. Ni(CO)4\text{Ni(CO)}_4
C. [Ni(CN)4]2−[\text{Ni(CN)}_4]^{2-}
D. [Ni(H2O)6]2+[\text{Ni(H}_2\text{O)}_6]^{2+}
E. Ni(PPh3)4\text{Ni(PPh}_3)_4

Choose the correct answer from the options given below :

Show answer and solution
Sol.
A. [NiCl4]2−[\text{NiCl}_4]^{2-}; Ni2+\text{Ni}^{2+}; 3d83d^8; sp3sp^3 hybridisation; 2 unpaired electrons; paramagnetic
B. Ni(CO)4\text{Ni(CO)}_4; Ni; 3d84s23d^8 4s^2; sp3sp^3 hybridisation; Zero unpaired electron; diamagnetic
C. [Ni(CN)4]2−[\text{Ni(CN)}_4]^{2-}; Ni2+\text{Ni}^{2+}; 3d83d^8; dsp2dsp^2 hybridisation; Zero unpaired electron; diamagnetic
D. [Ni(H2O)6]2+[\text{Ni(H}_2\text{O)}_6]^{2+}; Ni2+\text{Ni}^{2+}; 3d83d^8; sp3d2sp^3d^2 hybridisation; Two unpaired electron; paramagnetic
E. Ni(PPh3)4\text{Ni(PPh}_3)_4; Ni; 3d84s23d^8 4s^2; sp3sp^3 hybridisation; zero unpaired electron; Diamagnetic

Source: geekyrakshit/indian-exam-questions / neet2025-code45

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