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NEET Chemistry QUESTION #1093
Question 1
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\(_3\))\(_4\)
  • A and D only✔️
  • A, D and E only
  • A and C only
  • B and E only
Correct Answer Explanation
Ni\(^{2+}\) is [Ar]3d\(^8\). Paramagnetic if unpaired electrons: A: [NiCl\(_4\)]\(^{2-}\): Cl\(^-\) is weak field → tetrahedral, sp\(^3\), 2 unpaired → paramagnetic ✓. B: Ni(CO)\(_4\): Ni(0), CO is strong field → d\(^{10}\), diamagnetic. C: [Ni(CN)\(_4\)]\(^{2-}\): CN\(^-\) strong field → square planar, dsp\(^2\), 0 unpaired → diamagnetic. D: [Ni(H\(_2\)O)\(_6\)]\(^{2+}\): H\(_2\)O weak field → octahedral, 2 unpaired → paramagnetic ✓. E: Ni(PPh\(_3\))\(_4\): Ni(0), d\(^{10}\) → diamagnetic. Paramagnetic: A and D.