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  4. On adding excess of NH3 solution to CuSO4 solution, the dark blue colour is due to

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Q. On adding excess of $NH_3$ solution to $CuSO_4$ solution, the dark blue colour is due to

The d-and f-Block Elements

Solution:

$CuSO_{4} + 4NH_{3} \to [Cu(NH_{3})_{4}]^{++} SO^{--} _ {4}$