Q.

When Lassaigne’s extract (Na2S)  is acidified with acetic acid and then lead acetate solution is added to it, the colour of the precipitate is

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a

Blue

b

Black

c

Red

d

White

answer is B.

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Detailed Solution

Black PbS↓(Black)
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When Lassaigne’s extract (Na2S)  is acidified with acetic acid and then lead acetate solution is added to it, the colour of the precipitate is