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
- AEvolved I 2 is reduced
- BC u I 2 is formed
- CN a 2 S 2 O 3 is oxidised
- 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.