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Question

For the reaction: CO(g)+H2O(g)CO2(g)+H2(g) at a given temperature, the equilibrium amount of CO2(g) can be increased by :

A
Adding a suitable catalyst
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B
Adding an inert gas
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C
Decreasing the volume of the container
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D
Increasing the amount of CO(g)
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Solution

The correct option is D Increasing the amount of CO(g)
CO(g)+H2O(g)CO2(g)+H2(g)
At constant volume, there is no effect of addition of inert gas to a reaction in equilibrium.
At constant pressure, for the reactions for which Δn=0, there is no effect of addition of inert gas to a reaction in equilibrium.

The presence of a catalyst just helps to achieve the equilibrium at a different pace. It does not affect the amount of a reactant or a product at equilibrium.

Only if the reactant concentration is increased, the equilibrium shifts forward and the product concentration is increased.

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