For which one of the following properties of halogens does the sequence $F > Cl > Br > I$ hold good?

The bond energy of $Cl_2, Br_2$ and $I_2$ follows the order:

Among the following oxoacids,the correct decreasing order of acid strength is?

Which of the following statement$(s)$ regarding halogens is/are correct?

The compound which is added to table salt for maintaining proper health is

When treated with conc. $HCl$,$MnO_2$ yields a gas $(X)$ which further reacts with $Ca(OH)_2$ to generate a white solid $(Y)$. The solid $Y$ reacts with dil. $HCl$ to produce the same gas $X$. The solid $Y$ is