$H_2S$ is more acidic than $H_2O$,due to

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.

When Conc. $H_2SO_4$ is added to charcoal :-

Which one of the following is the correct decreasing order of boiling point?

Match the following items of List-$I$ with those in List-$II$ and choose the correct option.

List-$I$	List-$II$
$(a) \ [S_2 O_3]^{2-}$	$(I)$ Paramagnetic
$(b) \ H_2 O_2$	$(II)$ Toxic gas
$(c) \ H_2 S$	$(III)$ Strong reducing agent
$(d) \ S_2$	$(IV)$ Disproportionate in presence of $Mn^{2+}$

Concentrated $H_2SO_4$ reacts with $PCl_5$ to produce