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When H2S interacts with an acidic solution of K2Cr2O7, which of the following compounds is not produced?

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

Correct answer: CrSO4

Solution

In acidic medium K2Cr2O7 oxidizes H2S to elemental sulfur while Cr2O7^2- is reduced to Cr^3+, forming Cr2(SO4)3 and K2SO4. Chromium is reduced only to the +3 state, never +2, so CrSO4 (Cr^2+) is not produced. The compound not formed is CrSO4 (index 0); the stored answer K2SO4 is in fact produced.

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