Excess of KI reacts with CuSO4 solution, and Na2S2O3 solution is added to it. Which of the following statement is incorrect for the reaction?

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Evolved I2 is reduced

Cu2I2 is formed

Na2S2O3 is oxidised

Indicator in the second step is C6H52NH

answer is D.

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Detailed Solution

2CuSO4+4KI→Cu2I2+K2SO4+I2; 2Na2S2O3+I2→NaS4O6+2NaI;This is an example of iodometry.Indicator used is starch.

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