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Question

$$(X) (Black) {\xrightarrow [ ]{dil. H_2SO_4}} (Y) (gas) {\xrightarrow [ ]{dil. HNO_3}}$$ Colloidal Sulphur; Identify (X) :


A
CuS
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B
FeS
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C
PbS
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D
NiS
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Solution

The correct option is B $$FeS$$
The reaction takes place as follows:
$$FeS(Black) {\xrightarrow [ ]{dil. H_2SO_4}} H_2S(gas) {\xrightarrow [ ]{dil. HNO_3}}$$ Colloidal Sulphur

Chemistry

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