During the silver nitrate test for halogens, the sodium extract is first boiled with a few drops of HNO3 to

Question

During the silver nitrate test for halogens, the sodium extract is first boiled with a few drops of HNO3 to (A) Decompose sodium halides present (B) Help in the precipitation of AgCl (C) Increase the concentration of NO3- ions (D) Decompose Na2S and NaCN if formed

Tardigrade Admin · Accepted Answer

If nitrogen or sulphur is also present in the compound, the sodium fusion extract is first boiled with concentrated nitric acid to decompose cyanide or sulphide of sodium formed during Lassaigne’s test. These ions would otherwise interfere with the silver nitrate test for halogens.

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. During the silver nitrate test for halogens, the sodium extract is first boiled with a few drops of $H N O_{3}$ to

Decompose sodium halides present

Help in the precipitation of $A g Cl$

Increase the concentration of $N O_{3}^{-}$ ions

Decompose $N a_{2} S$ and $N a CN$ if formed

Q. During the silver nitrate test for halogens, the sodium extract is first boiled with a few drops of HNO3​ to

Decompose sodium halides present

Help in the precipitation of AgCl

Increase the concentration of NO3−​ ions

Decompose Na2​S and NaCN if formed

Q. During the silver nitrate test for halogens, the sodium extract is first boiled with a few drops of $H N O_{3}$ to

Help in the precipitation of $A g Cl$

Increase the concentration of $N O_{3}^{-}$ ions

Decompose $N a_{2} S$ and $N a CN$ if formed