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A mixture is heated with dil. \mathrm{H}_{2} \mathrm{SO}_{4} and the gas evolved turns lead acetate paper black. The mixture contains

Option: 1

Sulphite


Option: 2

Sulphide


Option: 3

Sulphate


Option: 4

Thiosulphate


Answers (1)

best_answer

Lead acetate paper is used for detection of \mathrm{H_2S}. Lead acetate paper turning black confirms the presence of Sulphide ions in solution.

\mathrm{Pb \left( CH _{3} COO \right)_{2}+ H _{2} S \rightarrow \underset{Black}{PbS} +2 CH _{3} COOH}

Hence, the correct answer is Option (2)

Posted by

Ritika Kankaria

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