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Assignment for Class 12 Chemistry Unit 04 Chemical Kinetics
Class 12 Chemistry students should refer to the following printable assignment in Pdf for Unit 04 Chemical Kinetics in Class 12. This test paper with questions and answers for Class 12 Chemistry will be very useful for exams and help you to score good marks
Unit 04 Chemical Kinetics Class 12 Chemistry Assignment
Ans. One gram of pulverized wood has more surface area and therefore, it burns faster than 1 gram of wood.
7. What is meant by effective collision ?
Ans- -The collision that leads to the formation of product molecule is called effective collision
8. Explain the term activated complex .
Ans - It is defined as intermediate compound between reactants and products which is highly unstable ,has the highest energy and readily changes into product
9. Define pseudo unimolecular reaction . Give two examples .
Ans - The reaction which is bimolecular but its order is one is called pseudo unimolecular reaction ,
e.g. CH3COOC2H5+H2O in presence of H+ → CH3COOH+C2H5OH
10. For a reaction: A + B → Products.
The rate law expression is, rate = k [A]1/3 .[B]2
What is the order of the reaction?
Ans: Order of the reaction = 1/3 + 2 = 7/2
LEVEL -2
1. The rate constant for a reaction of zero order in A is 0.0030 mol L−1 s−1. How long will it take for the initial concentration of A to fall from 0.10 M to 0.075 M?
Ans. For a first order reaction,
Question. The rate constant of first order reaction is 3 × 10–6 per second. The initial concentration is 0.10 M.
The initial rate is:
(a) 3 × 10–7 mol/litre/sec
(b) 3 × 10–8 mol/litre/sec
(c) 3 × 10–5 mol/litre/sec
(d) 3 × 10–8 mol/litre/sec
Question. The half-life of a substance in a certain enzymecatalysed reaction is 138 s. The time required for the concentration of the substance to fall from 1.28 mg L–1 to 0.04 mg L–1 is
(a) 414 s
(b) 552 s
(c) 690 s
(d) 276 s
Question. Half-life period of a first order reaction is 1386 seconds. The specific rate constant of the reaction is
(a) 0.5 × 10–2 s–1
(b) 0.5 × 10–3 s–1
(c) 5.0 × 10–2 s–1
(d) 5.0 × 10–3 s–1
Question. The activation energy for a simple chemical reaction A ⇌ B is Ea in forward direction. The activation energy for reverse reaction
(a) is negative of Ea
(b) is always less than Ea
(c) can be less than or more than Ea
(d) is always double of Ea.
Question. When a biochemical reaction is carried out in laboratory, outside the human body in absence of enzyme, then rate of reaction obtained is 10–6 times, the activation energy of reaction in the presence of enzyme is
(a) 6/RT
(b) P is required
(c) different from Ea obtained in laboratory
(d) can’t say anything.
Question. Which of the following statement is true for the reaction, H2 + Br2 →2HBr . The rate law is [ H2 ][ Br2 ]1/ 2 dx/dt=k
(a) order of reaction is 1.5
(b) molecularity of the reaction is 2
(c) by increasing the concentration of Br2 four times the rate of reaction is doubled
(d) all the above are correct.
Question. 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 concentration of both the reactants (A and B) are doubled, rate law for the reaction can be written as
(a) rate = k[A][B]2
(b) rate = k[A]2[B]2
(c) rate = k[A][B]
(d) rate = k[A]2[B]
Question. For the reaction : H2 Cl2 →sunlight 2HCl the order of reaction is
(a) 0
(b) 2
(c) 1
(d) 3
Question. The rate of a first order reaction is 1.5 × 10–2 mol L–1 min–1 at 0.5 M concentration of the reactant. The half-life of the reaction is
(a) 0.383 min
(b) 23.1 min
(c) 8.73 min
(d) 7.53 min
Question. Activation energy of a chemical reaction can be determined by
(a) evaluating rate constants at two different temperatures
(b) evaluating velocities of reaction at two different temperatures
(c) evaluating rate constant at standard temperature
(d) changing concentration of reactants.
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CBSE Class 12 Chemistry Unit 04 Chemical Kinetics Assignment
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Assignment for Chemistry CBSE Class 12 Unit 04 Chemical Kinetics
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Unit 04 Chemical Kinetics Assignment Chemistry CBSE Class 12
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Unit 04 Chemical Kinetics Assignment CBSE Class 12 Chemistry
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CBSE Chemistry Class 12 Unit 04 Chemical Kinetics Assignment
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