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  4. Copper sulphate solution reacts with KCN to give

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Q. Copper sulphate solution reacts with $KCN$ to give

VITEEEVITEEE 2019

Solution:

$\ce{CuSO4 + 2KCN->Cu (CN)2 + K2SO4}$
$\ce{2Cu (CN)2->Cu2 (CN)2 \,or\, 2CuCN +}$
$\underset{\text{cyanogen}}{\ce{CN - CN}}$
$\ce{CuCN+ 3KCN->K3}$$\underset{\text{colourless}}{\ce{[Cu(CN)4]}}$