Sodium nitroprusside, when added to an alkaline solution of...

Sodium nitroprusside, when added to an alkaline solution of sulphide ions, produce a

Options

Ared colouration
Bblue colouration
Cpurple colouration
Dbrown colouration

Correct answer

C. purple colouration

Step-by-step solution

This test is used for the presence of sulphur in any compound. When sodium nitroprusside, react with sulphide ion, $\left(e . g . {Na}_{2}S\right)$ the following reaction takes place

$\begin{cases}{Na}_{2}S + {Na}_{2}\left[Fe\left(CN\right)5NO\right] & ⟶ & {Na}_{4}\left[Fe\left(CN\right)5{NO}_{5}\right] \\ \left(Sod . nitroprusside\right) & & purplecoloration\left(sod . thionitroprusside\right)\end{cases}$

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