4 marksExplanation: Increasing the pressure (gases) of reactions increases the frequency of collisions, therefore increasing the rate of reaction.If the pressure is increased in a reaction involving gases, the equilibrium position moves in the direction of the fewest molecules of gas, to reduce the pressure.(yield)1.equilibrium position moves to the product side2.(because) fewer molecules / moles / particles on product side(rate)3.more collisions per unit time4.(because) more molecules / particles per unit volume