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AIIMS 2011
Exam
AIIMS
Year
2011
Subject
Chemistry
Chapter
Coordination Compounds

AIIMS 2011 · Chemistry · Coordination Compounds

The wavelength of light absorbed is highest in

The wavelength of light absorbed is highest in

Options

  1. A[Co(NH3)5Cl2+\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}^{2+}\right.
  2. B\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{H}_2 \mathrm{O}\right]^{3+}
  3. C\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right]^{3+}
  4. D[Co(en)3]3+\left[\mathrm{Co}(\mathrm{en})_3\right]^{3+}

Correct answer

A. [Co(NH3)5Cl2+\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}^{2+}\right.

Step-by-step solution

As in complex [Co(NH3)5Cl]2+\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5 \mathrm{Cl}\right]^{2+} unpaired electrons are present, so it requires less energy for excitation. Thus, the wavelength of light absorbed will be highest (i.e., E∝1/λE \propto 1 / \lambda ).
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