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Exess of KI reacts with `CuSO_(4)` solution and then `Na_(2)S_(2)O_(3)` solution is added to it. Which of the following statement is incorrect for this reaction ?
A. Evolved `I_(2)` is reduced
B. `CuI_(2)` is formed
C. `Na_(2)S_(2)O_(3)` is oxidised
D. `Cu_(2)I_(2)` is formed

1 Answer

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Correct Answer - B
`2CuSO_(4)+4KI rarr2K_(2)SO_(4)+Cu_(2)I_(2)+I_(2)`
`2Na_(2)S_(2)O_(3)+I_(2)rarr Na_(2)S_(4)O_(6)+2NaI,CuI_(2)` is not formed according to following reaction.
`2CuI_(2)(` unstable) `rarrCu_(2)I_(2)+I_(2)`

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