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  4. When excess of ammonia is added to copper sulphate solution, the deep blue coloured complex is formed. The complex is

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Q. When excess of ammonia is added to copper sulphate solution, the deep blue coloured complex is formed. The complex is

Coordination Compounds

Solution:

$Cu^{2+}+2OH^{-} \to Cu(OH)_{2}$
$Cu(OH)_{2}+4NH_{3} \to \underset{\text{deep blue}}{{[Cu(NH_{3})_{4}]^{2+}}}+ 2OH^{-}$
In $ [Cu (NH_{3})_{4}]^{2+}$ oxidation state of $Cu = + 2$
image
Hybridisation is $dsp^{2}$ hence geometry is square planar and paramagnetic due to presence of one unpaired electron.