A zero order reaction has half life time of 0.2 minute. If initial concentration of reactant is $0.2 \mathrm{~mol} \mathrm{dm}^{-3}$. Find rate constant.

Which of the following is NOT optically active compound?

What is the numerical value of gas constant $R$ in terms of $\mathrm{L} \mathrm{atm} \mathrm{K}^{-1} \mathrm{~mol}^{-1}$ ?

What type of solid is the silica?