Question 1 : In a first order reaction, the concentration of the reactant decreases from 0.8 M to 0.4 M in 15 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M is
1. 30 min
2. 15 min
3. 7.5 min
4. 60 min
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Question 2 : Consider an endothermic reaction, X → Y with activation energies Eb and Ef respectively for the backward and forward reactions, respectively. In general,
1. there is no definite relation between Eb and Ef
2. Eb > Ef
3. Eb < Ef
4. Eb = Ef
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Question 3 : The reaction: A → B follows first order kinetics. The time taken for 0.8 mol of A to produce 0.6 mol of B is 1 hour. What is the time taken for conversion of 0.9 mol of A to produce 0.675 mol of B?
1. 0.5 hour
2. 2 hour
3. 0.25 hour
4. 1 hour
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Question 4 : The half life period of a first order chemical reaction is 6.93 minutes. The time required for the completion of 99% of the chemical reaction will be (log 2 = 0.301)
1. 46.06 minutes
2. 230.3 minutes
3. 203 minutes
4. 460.6 minutes
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Question 5 : Which of the following statements for order of reaction is not correct?
1. It is not affected with the stoichiometric coefficients of the reactants
2. Order of a reaction is equal to the sum of the power of concentration terms in differential rate law
3. Order can be determined experimentally
4. Order cannot be fractional
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Question 6 : For the reaction A + B → products, it is observed that (i) On doubling the concentration of A only, the rate of reaction is also doubled. (ii) On doubling the initial concentration of both A and B, there is change by a factor of 8 in the rate of reaction. The rate of reaction is given by
1. rate = k [A] [B]
2. rate = k [A] [B]²
3. rate = k [A]² [B]
4. rate = k [A]² [B]²
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Question 7 : The rate of reaction between two reactants A and B decreases by a factor of 4 if the concentration of reactant B is doubled. The order of reaction with respect to reactant B is
1. -2
2. 2
3. -1
4. 1
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Question 8 : The time taken for 10% completion of a first order reaction is 20 min. Then, for 19% completion, the reaction will take
1. 50 mins
2. 60 mins
3. 40 mins
4. 30 mins
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Question 9 : A reaction involving two different reactants can never be
1. Bimolecular reaction
2. First order reaction
3. Second order reaction
4. Unimolecular reaction
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Question 10 : t1/4 can be taken as the time taken for the concentration of a reactant to drop to 3/4 of its initial value. If rate constant for a first order reaction is k, then t1/4 can be written as
1. 0.01/k
2. 0.69/k
3. 0.29/k
4. 0.75/k
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