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)_4Choose the correct answer from the options given below:

1. A and C only

2. B and E only

3. A and D only

4. A, D and E only

Doubtly Asked 30 Oct 2026 NEET UG 2025 Practice test neet Save WhatsApp Report

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Best answer

Answer: 3. A and D only

Key idea: paramagnetic means unpaired electrons.

A: \(\mathrm{[NiCl_4]^{2-}}\), \(\mathrm{Ni^{2+}}\) d⁸, weak field Cl^-, tetrahedral \(sp^3\): 2 unpaired, paramagnetic.
B: \(\mathrm{Ni(CO)_4}\), Ni(0) d¹⁰: diamagnetic.
C: \(\mathrm{[Ni(CN)_4]^{2-}}\), strong field, square planar \(dsp^2\): diamagnetic.
D: \(\mathrm{[Ni(H_2O)_6]^{2+}}\), d⁸ octahedral: 2 unpaired, paramagnetic.
E: \(\mathrm{Ni(PPh_3)_4}\), Ni(0) d¹⁰: diamagnetic.

A and D only: option (3).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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