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in Chemistry by (79.8k points)

Wavelength of red light is absorbed by the complex

(a) [Cu(CN)4]2-

(b) [Cu(NH3)4]2+

(c) CuSO4

(d) Cu(CN)2

1 Answer

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Best answer

The correct option is (b) [Cu(NH3)4]2+.

Explanation:

When NH4OH is added to the solution containing Cu2+ ions, deep blue solution is obtained.

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 greenish-blue colour.

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