Which from following nanoparticle catalysts is used in photocatalysis?

A gas absorbs $$150 \mathrm{~J}$$ heat and expands by $$300 \mathrm{~cm}^3$$ against a constant external pressure $$2 \times 10^5 \mathrm{~N} \mathrm{~m}^{-2}$$, What is $$\Delta \mathrm{U}$$ of the system?

A first order reaction takes 23.03 minutes for $$20 \%$$ decomposition. Calculate its rate constant.

Which among the following is dicarboxylic acid?