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 remove silver halides (B) to decompose Na2S and NaCN, if present (C) to dissolve Ag2S  (D) to dissolve AgCN, if formed

Tardigrade Admin · Accepted Answer

To test halogens, it is necessary to remove sodium cyanide and sodium sulphide from the sodium extract, if N and S are present. This is done by boiling sodium extract with conc

H N O_{3}

.

N a CN + H N O_{3} N a N O_{3} + H CN ↑

N a_{2} S + 2 H N O_{3} 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 remove silver halides

to decompose $N a_{2} S$ and $N a CN,$ if present

to dissolve $A g_{2} S$

to dissolve $A g CN,$ if formed

because $A g_{2} S$ and $A g CN$ are insoluble in nitric acid

To test halogens, it is necessary to remove sodium cyanide and sodium sulphide from the sodium extract, if N and S are present. This is done by boiling sodium extract with conc
$H N O_{3}$ . $N a CN + H N O_{3} N a N O_{3} + H CN ↑$ $N a_{2} S + 2 H N O_{3} 2 N a N O_{3} + H_{2} S ↑$

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

to remove silver halides

to decompose Na2​S and NaCN, if present

to dissolve Ag2​S

to dissolve AgCN, if formed

because Ag2​S and AgCN are insoluble in nitric acid

To test halogens, it is necessary to remove sodium cyanide and sodium sulphide from the sodium extract, if N and S are present. This is done by boiling sodium extract with conc HNO3​ . NaCN+HNO3​​NaNO3​+HCN↑ Na2​S+2HNO3​​2NaNO3​+H2​S↑

to decompose $N a_{2} S$ and $N a CN,$ if present

to dissolve $A g_{2} S$

to dissolve $A g CN,$ if formed

because $A g_{2} S$ and $A g CN$ are insoluble in nitric acid

To test halogens, it is necessary to remove sodium cyanide and sodium sulphide from the sodium extract, if N and S are present. This is done by boiling sodium extract with conc
$H N O_{3}$ . $N a CN + H N O_{3} N a N O_{3} + H CN ↑$ $N a_{2} S + 2 H N O_{3} 2 N a N O_{3} + H_{2} S ↑$