The equilibrium expression for a reaction is Ke = X2 / V ( a-X ) , what is true for this reaction?
Correct answer: B. Decrease in pressure will favour forward reaction
- A. Increase in pressure will favour forward reaction
- B. Decrease in pressure will favour forward reaction
- C. Decrease in pressure will favour backward reaction
- D. Increase in volume will favour backward reaction
Explanation
If volume factor is in denominator of Ke expression, it means moles (volume) of products are more than moles (volume) of reactants. According to Le-Chatelier principle, increase in pressure moves reaction in direction in which volume is less. So, less pressure favours the forward reaction. Hence, option b is correct.
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About Chemical Equilibrium
Reversible reactions reach dynamic equilibrium when forward and reverse rates become equal, and Le Chatelier's principle predicts the effect of changing concentration, pressure or temperature. The chapter also covers solubility product, the common ion effect, buffer action and the conditions used in Haber's process, with equilibrium shifts distinguished from changes in the equilibrium constant.
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