Chemical Reaction Engineering
If helium is introduced in a reactor containing O₂, SO₂ and SO₃ at equilibrium, so that total pressure increases while volume and temperature remains constant. In this case the dissociation of SO₃ (as per Le Chatlier principle)

Decreases
Remains unaltered
Changes unpredictably
Increases

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Chemical Reaction Engineering
A Catalyst

None of these
Changes the equilibrium constant of the reaction
Increases the equilibrium concentration of the product
Shortens the time to reach the equilibrium

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