Question

In the reaction A(g) + 2B(g) ⇌ C(g) + Q kJ, greater product will be obtained or the forward reaction is favoured by
A. At high temperatures and high pressure
B. At high temperatures and low pressure
C. At low temperatures and high pressure
D. At low temperatures and low pressure

Answer 1

Hint: We know that with an increase in the temperature of the reaction the rate of exothermic reaction decreases, and the rate of endothermic reaction increases. The exothermic reaction releases heat energy after the reaction and the endothermic reaction absorbs heat energy in the reaction.

Complete answer:The Simultaneous conversion of reactants into products and the products into reactants is called reversible reactions. It is a continuous reaction, and the reaction tries to attain equilibrium, at equilibrium the rate of forward reaction, and the rate of backward reaction is constant. The given reaction [ A_{(g)}+{2B}_{(g)}\rlharC_{(g)}+Q ], this reaction is an exothermic reaction because it releases heat. If we apply heat to the reaction that is if we give a high temperature to the reaction the rate of this reaction will decrease so for this reaction to be a forwarded reaction it will require a low temperature.

According to Le chatlier’s principle, if there are more molecules of reactant in a given volume of gas there will be more collisions and more collisions will increase the rate of forward reaction and increase the formation of the product. So, for this reaction to be a forward reaction, we require high pressure.
So, the reaction A(g)+2B(g)⇌C(g)+Q kJ, will be a forward reaction at low temperature and high pressure.

Thus, Option (C) is correct

Note: Reversible reaction tries to attain dynamic equilibrium. In dynamic equilibrium, the concentration of reactant and products remains constant. The reactants are never completely consumed in the reversible reaction. Temperature, pressure, concentration, and catalyst play an important role in a reversible reaction. This factor affects the rates of reversible reactions.