The value of H for the reaction X _ 2(g) + 4 Y _ 2(g) 2 XY _ 4(g) is less than zero. Formation of XY _ 4(g) will be favoured at :

NEET 2011 Chemistry question

The value of for the reaction

is less than zero. Formation of will be favoured at :

(1)High temperature and high pressure.
(2)Low pressure and low temperature.
(3)High temperature and low pressure.
(4)High pressure and low temperature.Correct

Answer: (4)

Solution

Apply Le Chatelier's principle. The forward reaction is exothermic (), so a low temperature favours the forward reaction (formation of ). The number of moles of gas decreases from 5 to 2 (), so high pressure favours the

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Question ID VK-090816