Name two poisonous gases which can be prepared from chlorine gas.

Which of the following pairs shows the highest bond dissociation enthalpy among halogens and the lowest bond dissociation enthalpy among hydrogen halides?

Concentrated $H_2SO_4$ cannot be used to prepare $HBr$ from $NaBr$,because it

When chlorine gas is passed through an aqueous solution of a potassium halide in the presence of chloroform,a violet colouration is obtained. On passing more of chlorine water,the violet colour disappears and the solution becomes colourless. This test confirms the presence of ........... in the aqueous solution.

The strongest reducing agent among the following is:

The mixture of concentrated $HCl$ and $HNO_3$ made in $3:1$ ratio contains