A weak base is $5 \%$ dissociated in its 0.01 M solution. Calculate the dissociation constant.

Which of the following compounds forms 1-bromo-1-methylcyclohexane when treated with HBr ?

$$ \mathrm{S} \xrightarrow{\text { Dimethylcadmium }} \text { Propanone }+ \text { Cadmium chloride } $$

Calculate work done in isothermal reversible expansion of 1 mole ideal gas from initial pressure 10 bar to final pressure 1 bar at 300 K . $\left(\mathrm{R}=8.314 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}\right)$.