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Chemical equilibrium
5 Class 10 Chemistry questions with answers and explanations.
Printable worksheet with answer key
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A reaction that can go in both directions is called:
- 1 Irreversible
- 2 Reversible
- 3 Slow
- 4 Explosive
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Correct answer: Reversible
A reversible reaction can proceed forwards and backwards.
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At equilibrium, the rates of the forward and backward reactions are:
- 1 Different
- 2 Zero
- 3 Infinite
- 4 Equal
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Correct answer: Equal
Chemical equilibrium is dynamic: the two rates are equal.
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In the Haber process, the product is:
- 1 Ammonia
- 2 Methane
- 3 Nitric acid
- 4 Sulphuric acid
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Increasing the pressure on N2 + 3H2 giving 2NH3 shifts the equilibrium:
- 1 To the left
- 2 To the right
- 3 It stops
- 4 It does not shift
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Correct answer: To the right
The right side has fewer moles of gas (2 against 4), so more pressure favours it.
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A catalyst in an equilibrium reaction:
- 1 Changes the equilibrium position
- 2 Speeds up reaching equilibrium
- 3 Increases the yield
- 4 Is used up
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Correct answer: Speeds up reaching equilibrium
A catalyst makes equilibrium reached sooner but does not change the position.