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Chemistry Question on d -and f -Block Elements

When CuSO4CuSO_4 solution is treated with an excess of KCNKCN, a colourless complex salt in which copper has a d10d^{10} configuration is obtained. This complex is

A

Cu(CN)2Cu(CN)_2

B

Cu2(CN)2Cu_2(CN)_2

C

[Cu(CN)4]3−\left[Cu\left(CN\right)_{4}\right]^{3-}

D

[Cu(CN)4]2−\left[Cu\left(CN\right)_{4}\right]^{2-}

Answer

[Cu(CN)4]3−\left[Cu\left(CN\right)_{4}\right]^{3-}

Explanation

Solution

CuSO4+2KCN→2Cu(CN)2+K2SO4CuSO_{4} +2KCN \to2Cu \left(CN\right)_{2} + K_{2}SO_{4} 2Cu(CN)2→2CuCN+(CN)22Cu \left(CN\right)_{2} \to2CuCN + \left(CN\right)_{2} CuCN+3KCN→K3[Cu(CN)4] Cu CN +3KCN \to K_{3}\left[Cu\left(CN\right)_{4}\right]