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  4. Copper sulphate solution, when added to an excess of ammonium hydroxide, forms a complex compound due to :

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Q. Copper sulphate solution, when added to an excess of ammonium hydroxide, forms a complex compound due to :

UPSEEUPSEE 2005

Solution:

$CuSO _{4}+ NH _{4} OH \longrightarrow \left[ Cu \left( NH _{3}\right)_{4}\right] SO _{4}+4 H _{2} O$

or $\left[ Cu \left( NH _{3}\right)_{4}\right]^{2+}$