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JEE Main 2004
Exam
JEE Main
Year
2004
Subject
Chemistry
Chapter
Redox Reactions

JEE Main 2004 · Chemistry · Redox Reactions

Excess of KI reacts with CuSO_4 solution and then Na_2 ~S_2 O_3...

Excess of KI\mathrm{KI} reacts with CuSO4\mathrm{CuSO}_4 solution and then Na2 S2O3\mathrm{Na}_2 \mathrm{~S}_2 \mathrm{O}_3 solution is added to it. Which of the statements is incorrect for this reaction?

Options

  1. ACu2\mathrm{Cu}_2\mathrm{I}2_2 is reduced
  2. BEvolved I2\mathrm{I}_2 is reduced
  3. CNa2 S2O3\mathrm{Na}_2 \mathrm{~S}_2 \mathrm{O}_3 is oxidized
  4. DCul2\mathrm{Cul}_2 is formed

Correct answer

D. Cul2\mathrm{Cul}_2 is formed

Step-by-step solution

2CuSO4+4KI2 \mathrm{CuSO}_4+4 \mathrm{KI} (excess) ⟶2 K2SO4+Cu2\longrightarrow 2 \mathrm{~K}_2 \mathrm{SO}_4+\mathrm{Cu}_2\mathrm{I}2+_2+\mathrm{I}2↑_2 \uparrow Na2 S2O3+\mathrm{Na}_2 \mathrm{~S}_2 \mathrm{O}_3+\mathrm{I}2⟶Na2 S4O6+2Nal_2 \longrightarrow \mathrm{Na}_2 \mathrm{~S}_4 \mathrm{O}_6+2 \mathrm{Nal}
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