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  4. When the sodium fusion extract of an organic compound is treated with lead acetate solution, the formation of a black-precipitate confirms the presence of the element:

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Q. When the sodium fusion extract of an organic compound is treated with lead acetate solution, the formation of a black-precipitate confirms the presence of the element:

KEAMKEAM 2001

Solution:

When a sodium fusion extract of an organic compound is treated with lead acetate solution, a black precipitate of $ PbS $ is formed. It confirms the presence of the element S. The reaction takes place as:
$ N{{a}_{2}}S+{{(C{{H}_{3}}COO)}_{2}}Pb\xrightarrow[{}]{{}}\underset{\begin{smallmatrix} lead\text{ }sulphide \\ (black\text{ }ppt.) \end{smallmatrix}}{\mathop{PbS}}\, $ $ +2C{{H}_{3}}COONa $