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(X) (Black) --dil. H2SO4--> (Y) (gas) --dil. HNO3--> Colloidal sulphur; Identify (X): — Qualitative and Quantitative Analysis Chemistry Question

Question

(X) (Black) --dil. H2SO4--> (Y) (gas) --dil. HNO3--> Colloidal sulphur; Identify (X):

Answer: B

💡 Solution & Explanation

FeS dissolves in dilute H2SO4 to release H2S gas (Y). H2S is oxidized by dil. HNO3 to give colloidal sulphur. CuS, PbS, and NiS do not dissolve in dilute H2SO4.

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