In the manufacture of bromine from sea water,the mother liquor containing bromides is treated with:

State the occurrence of group-$17$ elements.

The strongest reducing agent among the following is:

Oxidising action increases in halogens in the following order:

Chlorine reacts with hot and concentrated $NaOH$ and produces compounds $(X)$ and $(Y)$. Compound $(X)$ gives a white precipitate with silver nitrate solution. The average bond order between $Cl$ and $O$ atoms in $(Y)$ is

Which of the following halogens does not form oxyacid?