Among halogens,the one which can oxidise water to oxygen is:

The least active halogen with hydrogen is

In the halogen group,fluorine has the highest electronegativity according to the Pauling scale,yet its electron gain enthalpy is less negative than that of chlorine. This is because ....

The gas produced on heating $MnO_2$ with conc. $HCl$ is

Which of the following is not a mineral of fluorine?

Identify the weakest halogen acid from the following.