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Which one of the following statements is correct when SO2 is passed through acidified K2Cr2O7 solution?

1. The solution turns blue
2. The solution is decolourised
3. SO2 is reduced
4. Green Cr2(SO4)3 is formed

Correct answer: Green Cr2(SO4)3 is formed

Solution

When SO2 is passed through acidified K2Cr2O7 solution, it acts as a reducing agent and reduces Cr2O7^2- to Cr^3+, forming green Cr2(SO4)3.

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