In a vessel containing SO3, SO2 and O2 at equilibrium, some helium gas is introduced so that total pressure increases while temperature and volume remain the same. According to Le Chatelier's principle the dissociation of SO3 _________.
A
increases
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B
decreases
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C
remains unaltered
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D
changes unpredictably
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Solution
The correct option is A increases At constant volume, the partial pressures of the 3 components can remain constant & equilibrium will be unchanged. Adding He gas will increase the pressure of the system.