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For the equilibrium 2SO2(g) + O2(g) <-> 2SO3(g), which of the following actions shifts the equilibrium in the forward direction?

1. An adsorbent is used to remove SO3 as soon as it is formed.
2. A catalyst is used.
3. Small amounts of reactants are removed.
4. None of these

Correct answer: An adsorbent is used to remove SO3 as soon as it is formed.

Solution

Removing the product SO3 as it forms shifts equilibrium forward (Le Chatelier); a catalyst only speeds attainment of equilibrium and removing reactants would shift it backward.

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