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 :

Correct answer: C. A and D only (A) [NiCl_4]^ 2- Oxidation state =+2 Electronic configuration =3 d^8 4 s^0 Cl= W.F.L. No Pairing (D) [Ni (H_2 O)_6]^ 2+ Oxidation state =+2 , configuration =3 ~d^8 H_2 O is W.F.L. No pairing Hence both are paramagnetic.

NEET 2025

Exam: NEET
Year: 2025
Subject: Chemistry
Chapter: Coordination Compounds

NEET 2025 · Chemistry · Coordination Compounds

Which of the following are paramagnetic? A. [NiCl_4]^ 2- B....

Which of the following are paramagnetic? A.

\left[\mathrm{NiCl}_4\right]^{2-}

\mathrm{Ni}(\mathrm{CO})_4

\left[\mathrm{Ni}(\mathrm{CN})_4\right]^{2-}

\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}

\mathrm{Ni}\left(\mathrm{PPh}_3\right)_4

Choose the correct answer from the options given below : 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.

Options

A $\text{ A and C only }$
B $B \text{ and } E$ $\text{ only }$
C $\text{ A and D only }$
D $\mathrm{A}, \mathrm{D} \text{ and } \mathrm{E}$ $\text{ only }$

Correct answer

C. $\text{ A and D only }$

Step-by-step solution

(A)

\left[\mathrm{NiCl}_4\right]^{2-} \Rightarrow

Oxidation state

=+2

Electronic configuration

=3 d^8 4 s^0

\mathrm{Cl}=

W.F.L. No Pairing 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.

(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 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.

Hence both are paramagnetic.

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