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  • A metal sulphate A reacts with excess KCN to form a potassium salt B and compound C. But C is highly unstable and decomposes into D and cyanogen gas. What are A, B, C and D?<div class='qna-opti

A metal sulphate A reacts with excess KCN to form a potassium salt B and compound C. But C is highly unstable and decomposes into D and cyanogen gas. What are A, B, C and D?

Option: 1

\mathrm{A}=\mathrm{CuSO}_4, \mathrm{~B}=\mathrm{K}_2 \mathrm{SO}_4, \mathrm{C}=\mathrm{Cu}(\mathrm{CN})_2, \mathrm{D}=\mathrm{CuCN}


Option: 2

\mathrm{A}=\mathrm{CuSO}_4, \mathrm{~B}=\mathrm{K}_2 \mathrm{SO}_4, \mathrm{C}=\mathrm{CuCN}, \mathrm{D}=\mathrm{Cu}(\mathrm{CN})_2


Option: 3

\mathrm{A}=\mathrm{MnSO}_4, \mathrm{~B}=\mathrm{K}_2 \mathrm{SO}_4, \mathrm{C}=\mathrm{MnCN}, \mathrm{D}=\mathrm{Mn}(\mathrm{CN})_2


Option: 4

\mathrm{A}=\mathrm{MnSO}_4, \mathrm{~B}=\mathrm{K}_2 \mathrm{SO}_4, \mathrm{C}=\mathrm{Mn}(\mathrm{CN})_2, \mathrm{D}=\mathrm{MnCN}


Answers (1)

best_answer

Copper sulfate when dissolves in Potassium cyanide solution it reacts with potassium cyanide to form Potassium sulfate and Cupric cyanide, given as:

\mathrm{CuSO}_4+2 \mathrm{KCN} \longrightarrow \mathrm{K}_2 \mathrm{SO}_4+\mathrm{Cu}(\mathrm{CN})_2?

But, the formed product, Cupric cyanide is unstable, hence decomposes to form Cuprous cyanide and Cyanogen gas.

\mathrm{Cu}(\mathrm{CN})_2 \longrightarrow \mathrm{CuCN}+(\mathrm{CN})_2

 

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