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 (A) To dissolve Ag2S (B) To remove silver halides (C) To decompose Na2S and NaCN, if present (D) Because Ag2S and AgCN are insoluble in nitric acid

Tardigrade Admin · 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 CN + H N O_{3} \to N a N O_{3} + H CN ↑

N a_{2} S + 2 H N O_{3} \to 2 N a N O_{3} + H_{2} S ↑

Q. 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

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

To dissolve Ag2​S

To remove silver halides

To decompose Na2​S and NaCN, if present

Because Ag2​S and AgCN are insoluble in nitric acid

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. HNO3​ as follows NaCN+HNO3​→NaNO3​+HCN↑ Na2​S+2HNO3​→2NaNO3​+H2​S↑

To dissolve $A g_{2} S$

To decompose $N a_{2} S$ and NaCN, if present

Because $A g_{2} S$ and AgCN are insoluble in nitric acid