A) red colouration
B) blue colouration
C) purple colouration
D) brown colouration
Correct Answer: C
Solution :
During the test to detect the presence of sulphur in any organic compound, the sodium extract is divided into two parts and following tests are performed. (i) Lead acetate test \[\underset{\begin{smallmatrix} (From\,sodium \\ extract) \end{smallmatrix}}{\mathop{N{{a}_{2}}s}}\,+Pb{{(C{{H}_{3}}COO)}_{2}}\xrightarrow{{}}\] \[\underset{Black\,ppt.}{\mathop{PbS\downarrow }}\,+2C{{H}_{3}}COONa\] (ii) Sodium nitroprusside test: \[N{{a}_{2}}S+N{{a}_{2}}\underset{\begin{smallmatrix} Sodiumnitro \\ prusside \end{smallmatrix}}{\mathop{[Fe{{(CN)}_{5}}NO]}}\,\to \] \[\underset{\begin{smallmatrix} Purple\,colouration \\ Sodium\,thionitroprusside \end{smallmatrix}}{\mathop{N{{a}_{4}}[Fe{{(CN)}_{5}}NOS]}}\,\]
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