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When H2S is passed into an acidified solution of K2Cr2O7, which one of the following products is NOT formed?

1. K2SO4
2. Cr2(SO4)3
3. S
4. CrSO4

Correct answer: CrSO4

Solution

Acidified K2Cr2O7 oxidises H2S to elemental sulphur while itself being reduced to Cr3+ (giving Cr2(SO4)3), with K2SO4 also forming; CrSO4 (Cr2+) is not produced.

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