For a reaction if Kp > Kc the forward reaction is favoured by

Given KP > KCWe know KP = KC (RT)Δngiven  only when Δng is positive.Δng = np (g) - nR (g) is positivenp (g) > nR (g) From left to right i.e. forward reaction involves increase in volume.According to Le-Chatlier's principle reactions involving increase in volume are favoured at low pressure.