Which of the following is used to absorb sulphur dioxide?

Which of the following statements is correct regarding the oxygen family (Group $16$)?
$(i)$ The stability of $+6$ oxidation state decreases down the group and the stability of $+4$ oxidation state increases down the group.
$(ii)$ The stability of $+6$ oxidation state increases down the group and the stability of $+4$ oxidation state decreases down the group.
$(iii)$ Bonding in $+4$ and $+6$ oxidation states is primarily covalent.

What is produced by the hydrolysis of one mole of peroxodisulphuric acid $(H_2S_2O_8)$?

The triatomic species of elemental oxygen is known as

What are the specific densities of $\alpha$-sulphur and $\beta$-sulphur?

The most abundant element on the earth's crust is