NEET 2018 Chemistry question

Which one of the following conditions will favour maximum formation of the product in the reaction,

A_2(g) + B_2(g) X_2(g) Δ_rH = -X\ kJ?

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

Answer: (3)

Solution

The forward reaction has (2 mol of gas give 1 mol of gas) and is exothermic ( kJ). By Le Chatelier's principle, increasing the pressure shifts the equilibrium towards the side with fewer gas moles, i.e. the product ;

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Question ID VK-092277