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Question

Which one of the following statements is correct when SO2 is passed through acidified K2Cr2O7 solution?
  1. Green Cr2(SO4)3 is formed.
  2. The solution turns blue.
  3. The solution is decolourised.
  4. SO2 is reduced.


Solution

The correct option is A Green Cr2(SO4)3 is formed.
K2Cr2O7+SO2K2SO4+Cr2(SO4)3+H2O (Green)

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