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How is sulphur detected using the Sodium...

How is sulphur detected using the Sodium fusion extract of the given organic compound?

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Te sodium fusion extract is acidified with acetic and lead acetate. A black precipitate of lead sulphite is formed which indicates the presence of sulphur.
`overset(2-)(S)+overset(2+)(Pb)-underset("black ppt")(PbS)`
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