Explain each in short

In each of the reactions, how does the equilibrium respond to an increase in pressure? (forward, backward, unchange) (a) 2 SO(g) + O(g) 2 SO3(g) (b) H(g) + 12(g) 2 HI(g) (e) 3 H(g) + N(g) + 2 NH3(g) Equilibrium shift Equilibrium shift Equilibrium shift