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QAIPMT-2010-Ch-2011: NEET 2010 Chemistry - Class 12 AIPMT-2010-Ch-2011 Solution: Which of the following complex ions is not expected to absorb…

Which of the following complex ions is not expected to absorb visible light?

Multiple Choice Options

  • A [Ni(CN)4]2−[Ni(CN)_4]^{2-}
  • B [Cr(NH3)6]3+[Cr(NH_3)_6]^{3+}
  • C [Fe(H2O)6]2+[Fe(H_2O)_6]^{2+}
  • D [Ni(H2O)6]2+[Ni(H_2O)_6]^{2+}

Step-by-Step Verified Solution

A transition metal complex absorbs visible light only if it has unpaired electrons. Pairing occur because CN � is a strong field ligand. Thus, [Ni(CN) 4 ] 2� does not contain any unpaired electron so it does not absorb visible light. All other in the option contains pair of electrons thus absorb visible light.

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