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Question

Chemistry Question on coordination compounds

CuSO4CuSO_4 reacts with KCNKCN solution and forms

A

K3[Cu(CN)4]K _{3}\left[ Cu ( CN )_{4}\right]

B

Cu(CN)Cu ( CN )

C

Cu(CN)2Cu ( CN )_{2}

D

K4[Cu(CN)6]K _{4}\left[ Cu ( CN )_{6}\right]

Answer

K3[Cu(CN)4]K _{3}\left[ Cu ( CN )_{4}\right]

Explanation

Solution

CuSO4+2KCN→Cu(CN)2+K2SO4CuSO_{4} + 2KCN \to Cu\left(CN\right)_{2} + K_{2}SO_{4} 2Cu(CN)2→Cu2(CN)2+(CN)22Cu\left(CN\right)_{2} \to Cu_{2} \left(CN\right)_{2} + \left(CN\right)_{2} Cu2(CN)2+6KCN→2K3[Cu(CN)4]Cu_{2} \left(CN\right)_{2} + 6KCN \to 2K _{3} \left[Cu\left(CN\right)_{4} \right] 2CuSO4+10KCN→2K3Cu(CN)4+2K2SO4+(CN)22CuSO_{4} + 10KCN \to 2K_{3}Cu\left(CN\right)_{4} + 2K_{2}SO_{4} + \left(CN\right)_{2}