Which among the following is a feature of $$\mathrm{S}_{\mathrm{N}} 1$$ mechanism?

The volume of a gas is $$4 \mathrm{~dm}^3$$ at $$0^{\circ} \mathrm{C}$$. Calculate new volume at constant pressure when the temperature is increased by $$10^{\circ} \mathrm{C}$$.

Which following reagent is used in Etard reaction?

Which of the following processes exhibits increase in internal energy?