What is formed by the reaction of ozone with mercury?

It is possible to obtain oxygen from air by fractional distillation because

Which of the following dissociates to give ${H^{+}}$ most easily?

Identify the method used to obtain $SO_2$ gas in industry.

Group $16$ elements are also called:

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.