Failed to connect to MySQL: Access denied for user 'examnext_online'@'localhost' (using password: YES) Excess of KI reacts with `CuSO_4` solution and then `Na_2S_2O_3` solution is added to it. Which of the following statements is incorrect for this reaction? - Sarthaks eConnect

Excess of KI reacts with `CuSO_4` solution and then `Na_2S_2O_3` solution is added to it. Which of the following statements is incorrect for this reaction?

Excess of KI reacts with `CuSO_4` solution and then `Na_2S_2O_3` solution is added to it. Which of the following statements is incorrect for this reaction?

A.

Evolved `I_2` is reduced

B.

`CuI_2` is formed

C.

`Na_2S_2O_3` is oxidised

D.

`Cu_2I_2` is formed

Solution

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Best answer

`2CuSO_4+KI2K_2SO_4+Cu_2I_2+I_2`

`2Na_2S_2O_3+I_2Na_2S_4O_6+2NaI ; CuI_2` is not formed according to following reaction.

`2CuI_2`(unstable) `Cu_2I_2+I_2`