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Answer: 4. (C) > (A) > (B)

Key idea: stronger field ligands cause larger splitting \(\Delta_o\), so the complex absorbs higher energy light.

Ligand strength: en > \(\mathrm{H_2O}\). The more en ligands, the larger \(\Delta_o\):

  • (C) \(\mathrm{[Ni(en)_3]^{2+}}\): 3 en, largest \(\Delta_o\)
  • (A) \(\mathrm{[Ni(H_2O)_2(en)_2]^{2+}}\): 2 en
  • (B) \(\mathrm{[Ni(H_2O)_4(en)]^{2+}}\): 1 en, smallest

Energy absorbed: C > A > B, option 4.

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