(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: $\mathrm{XeF}_2 + \mathrm{H}_2\mathrm{O} \rightarrow$ 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: $\mathrm{S} + \mathrm{H}_2\mathrm{SO}_4 \xrightarrow[(\;\text{ Conc. }\;)]{}$ $\mathrm{Cl}_2 + \mathrm{NaOH} \xrightarrow[(\;\text{ Cold and dilute }\;)]{}$