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

Question

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

SO₂ is reduced.

Green Cr₂(SO₄)₃ is formed.

The solution turns blue.

The solution is decolourised.

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