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Q.

Which 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

White

b

Blue

c

Red

d

Black

answer is B.

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Detailed Solution

The sodium fusion extract is acidified with acetic acid and lead acetate solution is added. A black precipitate of lead sulphide indicates the presence of sulphur.

Na2S+CH3COO2PbPbS+2CH3COONa

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