(a) Account for the following:
(i) Tendency to show -2 oxidation state decreases from oxygen to tellurium.
(ii) Acidic character increases from $\mathrm{HF}$ to $\mathrm{HI}$.
(iii) Moist ${\mathrm{SO}}_2$ gas acts as a reducing agent.
(b) Draw the structure of an oxoacid of sulphur containing S-O-S linkage.
(c) Complex the following equation:
${\mathrm{XeF}}_2+{\mathrm{H}}_2\mathrm{O}\to$
OR
(a) Among the hydrides of group 16, write the hydride
(i) Which is a strong reducing agent.
(ii) Which has maximum bond angle.
(iii) Which most thermally stable.
Give suitable reason in each.
(b) Complete the following equations: