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NTA Abhyas JEE Main2020Chemistryd and f Block ElementsPractice

Excess of KI reacts with C u S O 4 solution and then N a 2 S 2 O 3 solution is added to it. Which of the statements is incorrect in this reaction?

Options

  1. AEvolved I 2 is reduced
  2. BC u I 2 is formed
  3. CN a 2 S 2 O 3 is oxidised
  4. DC u 2 I 2 is formed

Correct answer

B. C u I 2 is formed

Step-by-step solution

When excess of KI reacts with Copper sulphate followed by addition of hypo the reactions are as follows 2 C u S O 4 + 4 K I → C u 2 I 2 + 2 K 2 S O 4 + I 2 I 2 + 2 N a 2 S 2 O 3 → N a 2 S 4 O 6 + 2 N a I This liberated I 2 is reduced and N a 2 S 2 O 3 is oxidised.

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