In the detection of $II$ group acid radical,the salt containing chloride is treated with concentrated sulphuric acid,the colourless gas is liberated. The name of the gas is

The brown ring test is used to detect the presence of which ion?

$A$ salt gives violet vapours when treated with concentrated $H_2SO_4$,it contains

$A$ white crystalline salt $A$ reacts with dilute $HCl$ to liberate a suffocating gas $B$ and also forms a yellow precipitate. The gas $B$ turns potassium dichromate acidified with dilute $H_{2}SO_{4}$ to a green coloured solution $C$. $A$,$B$ and $C$ are respectively

An aqueous solution of a salt,when treated with $AgNO_3$ solution,gives a white precipitate which dissolves in $NH_4OH$. The radical present in the salt is:

In the qualitative analysis of nitrate,a brown ring is formed due to the formation of: