The reaction between hydrogen and iodine may be represented by the equation H₂(g)+ I₂(g) → 2HI(g), and is exothermic. Therefore

• A.an increase in temperature favours the forword reaction
• B.an increase in pressure favours the backward reaction
• C.both pressure and temperature muct be increased to favour the forward reaction
• D.a decrease in temperature will favour the forward reaction
• E.a decrease in pressure and an increase in temperature will favour the forward reaction