Calculate percentage atom economy when 46 g ethanol is obtained from 64.5 g chloroethane and $56 \mathrm{~g} \mathrm{KOH}_{(\mathrm{aq})}$.

The solubility product of the sparingly soluble salt $\mathrm{AB}_2$ is $2.56 \times 10^{-10}$ at 298 K . Calculate its solubility in $\mathrm{mol} \mathrm{dm}^{-3}$ at the same temperature?

Which of the following statements is NOT correct about ozone?

Identify the product ' B ' in the following reaction.

$$ \text { Sodium phenoxide } \xrightarrow[6 \,atm]{\mathrm{CO}_2, 398 \mathrm{~K}} \mathrm{~A} \xrightarrow{\mathrm{H}_3 \mathrm{O}^{+}} \mathrm{B} $$