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Question

What happens when K2Cr2O7 is treated with KI?


  1. Chromate is formed

  2. Chromyl chloride is obtained

  3. It liberates I2 from KI

  4. Acetic acid is formed


Solution

The correct option is C

It liberates I2 from KI


When K2Cr2O7 is treated with KI it liberates I2 from KI.

2K2Cr2O7  + 6KI + 7H2SO4      Cr2(SO4)3 + 4 K2SO4  + 7H2O + 3I 2

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