Question 11 : The rate equation for a reaction: A → B is r = K [A]°. If the initial concentration of the reactant is a mol dm–3, the half life period of the reaction is
1. a/2k
2. k/a
3. a/k
4. 2a/k
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Question 12 : The rate of a chemical reaction doubles for every 10°C rise of temperature. If the temperature is raised by 50°C, the rate of the reaction increases by about
1. 10 times
2. 32 times
3. 64 times
4. 24 times
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Question 13 : Radioactivity of a sample (z = 22) decreases 90% after 10 years. What will be the half-life of the sample?
1. 2 years
2. 5 years
3. 3 years
4. 10 years
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Question 14 : a catalyst is a substance which
1. increases the equilibrium concentration of the product
2. supplies energy to the reaction
3. increases the equilibrium constant of the reaction.
4. shortens the time to reach equilibrium
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Question 15 : The rate constant of a first order reaction depends on the
1. temperature
2. concentration of the product
3. concentration of the reactant
4. time
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Question 16 : The activation energy of a reaction at a given temperature is found to be 303 RT J mol– The ratio of rate constant to the Arrhenius factor is
1. 0.01
2. 0.02
3. 0.1
4. 0.001
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Question 17 : The time required for 100% completion of a zero order reaction is
1. ak
2. a/k
3. a/2k
4. 2k/a
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Question 18 : In the hydrolysis of an organic chloride in presence of large excess of water, RCl + H₂O → ROH + HCl
1. Moecularity is 1 and order of reaction is also 1
2. Molecularity is 2 but order of reaction is 1
3. Molecularity is 1 but order of reaction is 2
4. Molecularity and order of reaction both are 2
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Question 19 : In a reaction, A + B → Product, rate is doubled when the concentration of B is doubled, and rate increases by a factor of 8 when the concentrations of both the reactants (A and B) are doubled, rate law for the reaction can be written as
1. Rate = k[A][B]²
2. Rate = k[A]²[B]²
3. Rate = k[A] [B]
4. Rate = k[A]²[B]
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Question 20 : In a zero-order reaction for every 10° rise of temperature, the rate is doubled. If the temperature is increased from 10°C to 100°C, the rate of the reaction will become
1. 512 times
2. 256 times
3. 128 times
4. 64 times
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