Consider the equilibrium reaction represented by the following equation: 2SO_2(g) + O_2(g) ⇌ 2SO_3(g); ∆H = 395.7 kJmol^-1 Which of the following statements about the equilibrium system is correct?

• A Addition of catalyst changes the equailibrium position
• B Decrease in pressure increase in temperature SO₃
• C Decrease in pressure increases the equilibrium concentration of O₂
• D Increase in temperatur favours the forward reaction