Consider the Reaction, $4A\left(g\right)+B_2\left(g\right)\rightleftharpoons 2A_{2}B\left(g\right)-q$ where ‘q’ (positive) is heat exchange with surrounding. Initially A and $B_2$ are only present in stoichiometric ratio.

	Column–I (Qualitative representation of variation of concentration with time)		Column–II (effect on equilibrium)		Column–III (effect if any observed)
I)		I)	Increase in temperature	P)	$K_p$ constant
II)		II)	Increase in pressure	Q)	$K_p$ increases
III)		III)	Addition of $A_{2}B$ at equilibrium	R)	Standard free energy change of reaction increases
IV)		IV)	Addition of inert gas at constant pressure	S)	Rate constant of forward reaction and back ward reaction increase at new equilibrium

Each option has a triad in the order Column-I, Column-II and Column-III.