SATHEE: Organic Chemistry Some Basic Principles and Techniques

Organic Chemistry Some Basic Principles and Techniques - Result Question 53

####59. The Lassaigne’s extract is boiled with conc. $H N O_{3}$ while testing for halogens. By doing so it [2011]

(a) decomposes $N a_{2} S$ and $N a C N$ , if formed.

(b) helps in the precipitation of $A g C l$ .

(d) increases the concentration of $N O_{3}^{-}$ ions.

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Solution:

(a) Conc. $H N O_{3}$ decomposes $N a C N$ and $N a_{2} S$ to avoid their interference.

$\begin{aligned} N a C N + H N O_{3} ⟶ N a N O_{3} + H C N ↑ \\ N a_{2} S + 2 H N O_{3} ⟶ 2 N a N O_{3} + H_{2} S ↑ \end{aligned}$

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Organic Chemistry Some Basic Principles and Techniques - Result Question 53

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