A) nitrogen in the compound
B) sulphur in the compound
C) chlorine in compound
D) bromine in the compound
E) phosphorus in the compound
Correct Answer: B
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: \[N{{a}_{2}}S+{{(C{{H}_{3}}COO)}_{2}}Pb\xrightarrow[{}]{{}}\underset{\begin{smallmatrix} lead\text{ }sulphide \\ (black\text{ }ppt.) \end{smallmatrix}}{\mathop{PbS}}\,\] \[+2C{{H}_{3}}COONa\]
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