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Question

A white solid forms Rinmann's green in the charcoal cavity test in an oxidising flame. On treatment with dilute H2SO4, this solid produces a gas that turns an acidified dichromate paper green and lead acetate paper black. The white solid is:

A
PbS
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B
ZnSO3
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C
ZnS
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D
Na2S
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Solution

The correct option is B ZnS
Compound is ZnS.
Reactions:
ZnS+H2SO4ZnSO4+H2S
8KMNO4+7H2SO4+5H2S4K2SO4+8MnSO4+12H2O

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