Chemistry
Anurag added dilute H2SO4 to a given sample X and heated the mixture. He observed that a gas was liberated which had a foul smell of rotten eggs and it turned moist lead acetate paper silvery black. Name the gas evolved in the above case.
Sulphuric Acid
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Answer
Hydrogen sulphide gas
Reason — When dilute H2SO4 is added to a given sample X and heated, it produces H2S gas, which had a foul smell of rotten eggs.
Metal sulphide + H2SO4 (dil.) ⟶ Metal salt + H2S
H2S turns moist lead acetate paper black.
H2S + Pb(CH3COO)2 ⟶ PbS(Black) + 2CH3COOH
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