Class 11 Chemistry · Chapter 7 · Test 1
Chemical Kinetics Chapter 7
44 MCQ test covers Chapter 7. It has 12 exercise MCQs (Q.1 I to XII) and 32 topic-based MCQs, 2 for each of 16 topics from 7.1 to 7.6. Each question is worth 1 mark, for a total of 44 marks.
44 questions · 30 min · 44 marks
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Sample questions
The first 5 of 44. Try each one, then tap to see the answer.
Question 1
The rate of reaction:
- AIncreases as the reaction proceeds
- BDecreases as the reaction proceeds
- CRemains the same as the reaction proceeds
- DMay decrease or increase as the reaction proceeds
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Answer: B
The slope of the concentration graph is steepest at the beginning and becomes less steep as the reaction slows down with time.
Question 2
Increasing the temperature of a chemical reaction increases the rate of a reaction because:
- ABoth the collision frequency and collision energies of reactant molecules increase
- BCollision frequency of reactant molecules increases
- CActivation energy increase
- DActivation energy decrease
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Answer: A
Molecules at higher temperatures have more thermal energy so they collide more frequently and with greater energy.
Question 3
Consider two reactions with different activation energies at the same temperature. The reaction with the lower activation energy will have:
- AA smaller rate constant
- BA larger rate constant
- CThe same rate constant
- DA rate constant that depends on the enthalpy change
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Answer: B
A lower activation energy barrier lets a greater number of molecules get over it so the reaction rate and rate constant are larger.
Question 4
The order of a chemical reaction that is independent of concentration is:
- ASecond order reaction
- BFirst order reaction
- CZero order reaction
- DPseudo first order reaction
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Answer: C
The rate of a zero order reaction is independent of the concentration of the reactants.
Question 5
On a Boltzmann distribution curve the area under the curve represents:
- AActivation energy of the reaction.
- BTotal number of molecules in the sample.
- CAverage kinetic energy of the molecules.
- DRate constant of the reaction.
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Answer: B
The text states that the area under the curve represents the number of particles.
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