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Coordination Compounds question

2010 · Q93
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Coordination Compounds question

2010 · Q93

NEETChemistryCoordination CompoundsMCQ+4 / −1
Which of the following complex ions is not expected to absorb visible light?
  1. A
    [Ni(CN)4]2−-−
  2. B
    [Cr(NH3)6]3+
  3. C
    [Fe(H2O)6]2+
  4. D
    [Ni(H2O)6]2+
View written solutionFree

Correct answer: A

A transition metal complex absorbs visible light only if it has unpaired electrons.

AIPMT 2010 Prelims Chemistry - Coordination Compounds Question 65 English Explanation


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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