If pressure is applied to the equilibrium of liquid $\rightleftharpoons$ vapour,the boiling point of liquid:-

For the reaction $PCl_{5(g)} \rightleftharpoons PCl_{3(g)} + Cl_{2(g)}$,the forward reaction is favored at constant temperature by: $(1)$ Adding an inert gas at constant volume $(2)$ Adding $Cl_{2(g)}$ at constant volume $(3)$ Adding an inert gas at constant pressure $(4)$ Increasing the volume of the container $(5)$ Adding $PCl_{5(g)}$ at constant volume

Which of the following equilibria will shift to the right side by an increase in pressure?

$(a)$ What is required in chemical synthesis? What will be done for that?
$(b)$ Write Le Chatelier's principle.

Change in volume of the system does not alter the number of moles in which of the following equilibrium?

In a reversible reaction,a catalyst is a substance that .....