The value of H for the reaction, (AIPMT 2011) X g 4Y g 2XY g is less than zero. Formation of XY4(g) will be favoured at

According to the Le-Chatelier’s principle, for an exothermic reaction, with the decrease in the temperature, the reaction is favoured in the forward reaction. And with the increase in pressure, the reaction is favoured in the direction where lesser number moles are present. So, option (a) is the correct answer.