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  4. Wavelength of red light is absorbed by the complex

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Q. Wavelength of red light is absorbed by the complex

AIIMSAIIMS 2007Coordination Compounds

Solution:

When $NH_4OH$ is added to the solution containing $Cu^{2+}$ ions, deep blue solution is obtained.

$Cu^{2+} + 4NH_4OH \rightarrow \underset{\text{deep blue solution}}{[Cu(NH_3)_4]^{2+} }\rightarrow + \,4H_2O$
Hydrated cupric compounds absorb radiations corresponding to red light and the transmitted colour is greenish blue (which is complementary to red colour). Thus, cupric compounds give greenishblue colour.