State the inference drawn from the following observations:
A gas Q turns moist lead acetate paper silvery black. Identify the gas Q.

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Solution

The gas Q liberated is Hydrogen Sulphide, $H_{2} S$ .
Hydrogen Sulphide, $H_{2} S$ , turns a moist Lead Acetate ( $P b {(C H_{3} C O O)}_{2}$ ) paper silvery black.

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