Which one of the following halogens liberates oxygen when passed through hot concentrated $KOH$ solution?

$HBr$ and $HI$ reduce sulphuric acid,$HCl$ can reduce $KMnO_4$ and $HF$ can reduce:

Which of the following acids is normally handled in metal apparatus made of $Cu$ because it attacks glass?

When $1 \ mol$ of fluorine reacts with $2 \ mol$ of hot and concentrated $KOH$,the products formed are $KF$,$H_2O$,and $O_2$. What is the molar ratio of $KF$,$H_2O$,and $O_2$ produced?

Which among the following oxoacids of chlorine exhibits $+3$ oxidation state of chlorine?

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