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Chemical equilibrium
5 Class 11 Chemistry questions with answers and explanations.
Printable worksheet with answer key
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For N2 + 3H2 giving 2NH3, the equilibrium constant Kc is:
- 1 [NH3]2 / ([N2][H2]3)
- 2 [NH3]2 x [N2][H2]3
- 3 [NH3] / ([N2][H2])
- 4 [N2][H2]3 / [NH3]2
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Correct answer: [NH3]2 / ([N2][H2]3)
Products over reactants, each raised to its coefficient.
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Le Chatelier's principle says a system at equilibrium responds to a disturbance by:
- 1 Increasing the change
- 2 Opposing the change
- 3 Stopping
- 4 Doubling Kc
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Correct answer: Opposing the change
The system shifts to partly oppose the change imposed.
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Adding a catalyst to a reaction at equilibrium:
- 1 Does not change the value of Kc
- 2 Changes the value of Kc
- 3 Doubles the yield
- 4 Stops the reaction
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Correct answer: Does not change the value of Kc
A catalyst speeds both directions equally.
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If Kc is much greater than 1, the equilibrium favours:
- 1 Products
- 2 Reactants
- 3 Neither
- 4 Catalysts
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Correct answer: Products
A large Kc means more products at equilibrium.
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Raising the temperature of an exothermic reaction at equilibrium shifts it to the:
- 1 Reactants
- 2 No shift
- 3 Catalyst
- 4 Products
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Correct answer: Reactants
Heat is a product in an exothermic reaction, so adding heat favours the reactants.