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Question:

Which of the following is not formed when H2S reacts with acidic K2Cr2O7 solution?

S

Cr2(SO4)3

H2O

CrSO4

Solution:

3H2S + K2Cr2O7 + 4H2SO4 → 3S + Cr2(SO4)3 + K2SO4 + 7H2O
Hydrogen sulfide reacts with acidic (H2SO4) potassium dichromate to produce sulfur, chromium(III) sulphate (Cr2(SO4)3), potassium sulphate (K2SO4) and water. Hence option CrSO4 is correct.