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  • The Lassaigne's extract is boiled with conc HNO3 while testing for halogens. By doing so it :Option: 1 Increases the concentration of

The Lassaigne's extract is boiled with conc HNO3 while testing for halogens. By doing so it :

Option: 1

Increases the concentration of \text{NO}_{3}^{-} ions


Option: 2

Decomposes Na2S and NaCN, if formed


Option: 3

Helps in the precipitation of AgCl


Option: 4

Increases the solubility product of AgCl


Answers (1)

best_answer

In case of Lassaigne's test of halogens, it is necessary to remove sodium cyanide and sodium sulphide from the sodium extract if nitrogen and sulphur are present. This is done by boiling the sodium extract with conc. HNO_{3}.

\begin{aligned} &\mathrm{NaCN}+\mathrm{HNO}_{3} \rightarrow \mathrm{NaNO}_{3}+\mathrm{HCN} \uparrow\\ &\mathrm{Na}_{2} \mathrm{S}+2 \mathrm{HNO}_{3} \rightarrow 2 \mathrm{NaNO}_{3}+\mathrm{H}_{2} \mathrm{S} \uparrow \end{aligned}

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