Which of the following are paramagnetic? A. [ NiCl 4 ] 2- B. Ni ( CO ) 4 C. [ Ni ( CN ) 4 ] 2- D. [ Ni ( H 2 O ) 6 ] 2+ E. Ni ( PPh 3 ) 4 Choose the correct answer from the options given below:

Chemistry · Coordination Compounds

NEET (UG) 2025 — Question 47

Which of the following are paramagnetic?

A. $\left[\mathrm{NiCl}_{4}\right]^{2-}$

B. $\mathrm{Ni}(\mathrm{CO})_{4}$

C. $\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}$

D. $\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$

E. $\mathrm{Ni}\left(\mathrm{PPh}_{3}\right)_{4}$

Choose the correct answer from the options given below:

(A) $\left[\mathrm{NiCl}_{4}\right]^{2-} \Rightarrow$ Oxidation state $=+2$

Electronic configuration $=3 \mathrm{~d}^{8} 4 \mathrm{~s}^{0}$

$\mathrm{Cl}=$ W.F.L. No Pairing

2 unpaired electrons

(D) $\left[\mathrm{Ni}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$

Oxidation state $=+2$ , configuration $=3 \mathrm{~d}^{8}$

$\mathrm{H}_{2} \mathrm{O}$ is W.F.L. No pairing

2 unpaired electrons

Hence both are paramagnetic

Answer key and solution verified before publishing.

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