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Coordination Compounds question

2017 · Q101
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Coordination Compounds question

2017 · Q101

NEETChemistryCoordination CompoundsMCQ+4 / −1
Correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co3+ is
  1. A
    [Co(H2O)6]3+, [Co(en)3]3+, [Co(NH3)6]3+
  2. B
    [Co(H2O)6]3+, [Co(NH3)6]3+, [Co(en)3]3+
  3. C
    [Co(NH3)6]3+, [Co(en)3]3+, [Co(H2O)6]3+
  4. D
    [Co(en)3]3+, [Co(NH3)6]3+, [Co(H2O)6]3+
View written solutionFree

Correct answer: D

Increasing order of wavelength of absorption is

Δ\Delta Δ0 = en > NH3 > H2

Δ\Delta Δ0 = E = hcλ{{hc} \over \lambda }λhc​

Thus, increasing order of wavelength of absorption is:

[Co(en)3]3+ <\lt < [Co(NH3)6]3+ <\lt < [Co(H2O)6]3+

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