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Question
The yield of product in the reaction, A2(g)+2B(g)⇌C(g)+Q kJ would be higher at:
The yield of product in the reaction, A2(g)+2B(g)⇌C(g)+Q kJ would be higher at:
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Solution
The correct option is A low temperature and high pressure
Most favourable conditions of temperature and pressure for greater yield of C are high pressure and low temperature.
High pressure is maintained because the moles of the product is less than the moles of reactants.
Δng=1−(1+2)=−2, Δng<0
When pressure is increased, the equilibrium will shift to the product side (which contains less number of moles of gaseous species). This nullifies the effect of the increase in pressure. Hence, more and more product will be formed.
According to Le Chatelier's principle, when a system at equilibrium is disturbed, the position of the equilibrium shifts in a direction so that the effect of the change is nullified.
Low temperature favours exothermic reaction. Heat is evolved during the reaction (positive value of enthalpy change).
Most favourable conditions of temperature and pressure for greater yield of C are high pressure and low temperature.
High pressure is maintained because the moles of the product is less than the moles of reactants.
Δng=1−(1+2)=−2, Δng<0
When pressure is increased, the equilibrium will shift to the product side (which contains less number of moles of gaseous species). This nullifies the effect of the increase in pressure. Hence, more and more product will be formed.
According to Le Chatelier's principle, when a system at equilibrium is disturbed, the position of the equilibrium shifts in a direction so that the effect of the change is nullified.
Low temperature favours exothermic reaction. Heat is evolved during the reaction (positive value of enthalpy change).
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