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Question

A gas is obtained by addition of dil. H2SO4 to a mixture which turns lead acetate paper black. It is:

A
SO2
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B
CO2
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C
H2S
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D
NO2
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Solution

The correct option is B H2S
When FeS is treated with dil. H2SO4 then H2S gas is produced , which turns lead acetate paper black.
FeS+H2SO4H2S+FeSO4
H2S+(CH3COO)2PbPbS(black)+2CH3COOH

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