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Question

Consider the following equilibrium system;SO2(g)+12O2(g)SO3(g); set up in a cylinder fitted with a piston. Some inert gas is added and the piston is moved outwards to keep the total gaseous pressure constant. Predict which of the following is true?

A
Addition of inert gas does not affect the equilibrium.
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B
Less SO3(g) is produced.
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C
More SO3(g) is produced.
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D
The system moves to new equilibrium position which cannot be predicted theoretically.
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Solution

The correct option is B Less SO3(g) is produced.
SO2(g)+12O2(g)SO3(g)
The number of moles of reactants=1+12=32
The number of moles of product =1
According to Le-Chatelier's principle, if inert gas is added at constant pressure, it will increase the volume of the system. Therefore, the quilibrium will shift in a direction in which there is an increase in the number of moles of gases.
Here, the quilibrium will shift backwards.
Less SO3(g) is less produced.
Answer:(B) Less SO3(g) is produced.

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