REVIEW EXERCISES

Account for the following : $\mathrm{HOCl}$ is stronger acids than $\mathrm{HOI}$.

Account for the following: $\mathrm{HClO}$ is weaker acid than ${\mathrm{HClO}}_2$.

Of the noble gases, only xenon is known to form well established chemical compounds. 

How is ${\mathrm{O}}_2$ obtained in the laboratory?

Why ${\mathrm{O}}_2$ is inert at room temperature?

Give the balanced chemical equations for the reactions of ${\mathrm{O}}_2$ with $\mathrm{Na}, {\mathrm{N}}_2, \mathrm{C}, {\mathrm{P}}_4, {\mathrm{S}}_8, \mathrm{NO}, {\mathrm{SO}}_2, {\mathrm{NH}}_3, \mathrm{HCl}, {\mathrm{CS}}_2$ and $\mathrm{ZnS}$.

How does chlorine occur in nature? Give names and formulae of its important minerals.

How is ${\mathrm{Cl}}_2$ obtained in the laboratory? Describe its important properties and uses?