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  4. When an aqueous solution of copper (II) sulphate is saturated with ammonia, the blue compound crystallises on evaporation. The formula of this blue compound is:

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Q. When an aqueous solution of copper (II) sulphate is saturated with ammonia, the blue compound crystallises on evaporation. The formula of this blue compound is:

BITSATBITSAT 2018

Solution:

The aqueous solution of copper(II) sulphate reacts with ammonia to form blue colored crystalline complex $\left[ Cu \left( NH _{3}\right)_{4}\right] SO _{4} \cdot H _{2} O$
$CuSO _{4}+4 NH _{3}+ H _{2} O \rightarrow\left[ Cu \left( NH _{3}\right)_{4}\right] SO _{4} \cdot H _{2} O$
The $Cu ^{2+}$ ion undergoes dsp $^{2}$ hybridization which results in square planar geometry.