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Question

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

A
K2SO4
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B
Cr2(SO4)3
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C
S
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D
CrSO4
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Solution

The correct option is D CrSO4
K2Cr2O7+H2SCr2(SO4)3+S+K2SO4+H2O

The oxidation number of chromium changes from +6 to +3, not to 2! so CrSO4 cannot be formed.

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