Q1Multiple choice
The role of a catalyst is to change ______________.
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Correct option: C
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Worked solution
Option (iii) is the answer.
NCERT Exemplar · Class 12 · Chemistry
Chapter 4: Chemical Kinetics
Practice each question, then open the answer or worked solution.
I. Multiple Choice Questions (Type-I)
12 questionsQ2Multiple choice
In the presence of a catalyst, the heat evolved or absorbed during the reaction
___________.
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Correct option: C
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Worked solution
Option (iii) is the answer.
Q3Multiple choice
Activation energy of a chemical reaction can be determined by _____________.
temperatures.
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Correct option: B
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Worked solution
Option (ii) is the answer.
Q4Multiple choice
Consider Fig. 4.1 and mark the correct option.
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Correct option: A
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Worked solution
Option (i) is the answer.
Q5Multiple choice
Consider a first order gas phase decomposition reaction given below :
A(g) → B(g) + C(g)
The initial pressure of the system before decomposition of A was pi. After lapse of time ‘t’, total pressure of the system increased by x units and became ‘pt The rate constant k for the reaction is given as _________.
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Correct option: B
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Worked solution
Option (ii) is the answer.
Q6Written answer
According to Arrhenius equation rate constant k is equal to A e–E /RT a. Which
of the following options represents the graph of ln k vs 1/T
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Worked solution
Option (i) is the answer.
Q7Multiple choice
Consider the Arrhenius equation given below and mark the correct option.
a–E /RT k = A e
and decreasing temperature.
and decreasing temperature.
and decreasing temperature.
and increasing temperature
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Correct option: D
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Worked solution
Option (iv) is the answer.
Q8Written answer
A graph of volume of hydrogen released vs time for the reaction between zinc
and dil.HCl is given in Fig. 4.2. On the basis of this mark the correct option.
(i) Average rate up to 40s is V3-V2/40
(ii) Average rate up to 40s is V3-V2/40-30
(ii) Average rate up to 40 seconds is V3/40
(iv) Average rate up to 40 seconds is V3-V1/40-20
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Worked solution
Option (iii) is the answer.
Q9Multiple choice
Which of the following statements is not correct about an order of a reaction.
coefficients of reactants in the balanced chemical equation for a reaction.
of the reactants in the rate law expression.
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Correct option: C
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Worked solution
Option (iii) is the answer.
Q10Multiple choice
Consider the graph given in Fig. 4.2. Which of the following options does not
show the instantaneous rate of reaction at 40th second?
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Correct option: B
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Worked solution
Option (ii) is the answer.