In Lassaigne’s test for the detection of halogens, the sodium fusion extract is first boiled with concentrated nitric acid. This is

Question

In Lassaigne’s test for the detection of halogens, the sodium fusion extract is first boiled with concentrated nitric acid. This is, To dissolve A g 2 S, To remove silver halides, To decompose N a 2 S and NaCN, if present, Because A g 2 S and AgCN are insoluble in nitric acid

MARKS App · Accepted Answer

For the test of halogens, it is necessary to remove sodium cyanide and sodium sulphide from the sodium extract if N and S are present. It is possible by boiling sodium extract with cocn. H N O 3 as follows 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 ↑

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