What is the color of the precipitate obtained in the test for sulphur?

White

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Black

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Violet

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Blue

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Solution

The correct option is B Black
In the test for sulphur, the sodium fusion extract is acidified with acetic acid and lead acetate is added to it. Once this reaction takes place, a black precipitate is formed. This black precipitate is lead acetate, indicating the presence of sulphur.
$N a_{2} S + P b (C H_{3} C O O)_{2} \to P b S ↓ + 2 C H_{3} C O O N a$

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