Class 11 Chemistry · Chapter 8 · Test 1
Chemical Equilibrium Chapter 8
41 MCQ test covers Chapter 8. It has 9 exercise MCQs (Q.1 II to X) and 32 topic-based MCQs, 2 for each of 16 topics from 8.1 to 8.16. Each question is worth 1 mark, for a total of 41 marks.
41 questions · 30 min · 41 marks
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Sample questions
The first 5 of 41. Try each one, then tap to see the answer.
Question 1
Which statement about the equilibrium 2SO2(g) + O2(g) <-> 2SO3(g) (exothermic) is correct?
- AThe value of Kp falls with a rise in temperature.
- BThe value of Kp falls with increasing pressure.
- CAdding V2O5 catalyst increases the equilibrium yield of sulphur trioxide.
- DThe value of Kp is equal to Kc.
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Answer: A
For this exothermic reaction an increase in temperature shifts the equilibrium to the left and the equilibrium constant decreases. A catalyst does not change the yield and pressure does not change the constant.
Question 2
The conventional equilibrium constant expression (Kc) for 2SO3(g) <-> 2SO2(g) + O2(g) is:
- A[SO2]^2/[SO3]
- B[SO2]^2[O2]/[SO3]^2
- C[SO3]^2/[SO2]^2[O2]
- D[SO2][O2]
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Answer: B
Kc = [products] raised to their coefficients divided by [reactants] raised to their coefficients = [SO2]^2[O2]/[SO3]^2.
Question 3
A saturated solution represents a dynamic equilibrium. Microscopically the concentration of dissolved solute is constant because:
- ANo more solute particles are dissolving.
- BThe rate of dissolution of solute is zero.
- CSolute particles are dissolving and precipitating at the same rate.
- DAll solute particles have dissolved.
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Answer: C
At dynamic equilibrium the rates of the forward and reverse processes are equal so there is no net change although the particles keep changing.
Question 4
Which of the following statements correctly describes the effect of temperature on the equilibrium constant?
- AKc is directly proportional to temperature.
- BKc is inversely proportional to temperature.
- CKc depends on the enthalpy change of the reaction.
- DTemperature has no effect on the value of Kc.
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Answer: C
Temperature is the only factor that changes Kc and whether Kc rises or falls depends on whether the reaction is exothermic or endothermic.
Question 5
For 2H2O(g) <-> 2H2(g) + O2(g) with an endothermic forward reaction which change will decrease the equilibrium amount of H2O?
- AAdding more oxygen
- BAdding a solid phase catalyst
- CDecreasing the volume of the container
- DIncreasing the temperature at constant pressure
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Answer: D
Raising the temperature favours the endothermic forward reaction so more H2O is used up. Adding O2 or raising pressure shifts the reaction to the left and a catalyst does not shift the position.
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