Which one of the following conditions will favour maximum formation of the product in the reaction,
$A_{2} (g) + B_{2} (g) ⇌ X_{2} (g), Δ_{r} H = - X k J$ ?

High temperature and high pressure

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Low temperature and high pressure

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High temperature and low pressure

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Low temperature and low pressure

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Solution

The correct option is B Low temperature and high pressure
For the reaction, $A_{2} (g) + B_{2} (g) ⇌ X_{2} (g), Δ_{r} H = - X k J$ suggest exothermic nature for forward reaction.
Exothermic reaction has negative value for $Δ_{r} H$ .
Exothermic reaction is favored at low temperature.
The forward reaction has $Δ n = 1 - (1 + 1) = - 1$ . Such reaction is favored at high pressure.

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