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Question

For the reaction
CO(g)+H2O(g)CO2(g)+H2(g) at a given temeprature, 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)
Adding a reactant will drive the reaction in the forward direction in order to reestablish equilibrium. Therefore, addition of CO(g) will increase the equilibrium amount of CO2.
Since Δng=0, adding an inert gas or changing the volume would have no effect. A catalyst speeds up forward and backward reactions equally, so it would not affect the concentrations either.

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