Peroxodisulphuric acid $(H_2S_2O_8)$ contains which of the following bonds?

Name the gas that can readily decolourise acidified $KMnO_4$ solution.

Assertion : There is a large difference between the melting and boiling points of $O$ and $S$.
Reason : It can be explained on the basis of their atomicity in $O_2$ and $S_8$ molecules.

Which form of sulphur shows paramagnetic behaviour?

Identify the element having the highest density from the following.

Point out in which of the following properties oxygen differs from the rest of the members of its family (Group-$16$)