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Question
In a reaction
A2(g)+4B2(g)⇋2AB4(g);ΔH<0,the formation of AB4(g) will be favoured at:
In a reaction
A2(g)+4B2(g)⇋2AB4(g);ΔH<0,the formation of AB4(g) will be favoured at:
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Solution
The correct option is C low temperature and high pressure
The equilibrium reaction is A2(g)+4B2(g)⇔2AB4(g);ΔH<0.
The negative value of enthalpy change indicates that the forward reaction is exothermic.
When the temperature is lowered, the reaction will proceed in the forward direction so that heat is liberated which will nullify the effect of lowered temperature.
The forward reaction proceeds with decrease in the number of moles, the increased pressure will shift the equilibrium towards right which will decrease the number of moles and nullify the effect of increased pressure. This will increase the yield of the forward reaction.
Thus the formation of AB4(g) will be favoured at low temperature and high pressure.
Option A is correct.
The equilibrium reaction is A2(g)+4B2(g)⇔2AB4(g);ΔH<0.
The negative value of enthalpy change indicates that the forward reaction is exothermic.
When the temperature is lowered, the reaction will proceed in the forward direction so that heat is liberated which will nullify the effect of lowered temperature.
The forward reaction proceeds with decrease in the number of moles, the increased pressure will shift the equilibrium towards right which will decrease the number of moles and nullify the effect of increased pressure. This will increase the yield of the forward reaction.
Thus the formation of AB4(g) will be favoured at low temperature and high pressure.
Option A is correct.
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