The catalyst used in the contact process for the manufacturing of sulphuric acid is

What are the other names for monoclinic sulfur and rhombic sulfur?

Identify the correct order of acidity of hydrides of $16^{th}$ group elements from the following.

The catalyst used in the contact process is

Which of the following ions possesses an $S-O-S$ bond?

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.