CBSE Class 12 Chemistry Chemical Kinetics Question Bank Set 02

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QUESTION BANK
Chemical Kinetics
 
VSA QUESTIONS (1 - MARK QUESTIONS)
 
1. Why does the rate of a reaction not remain constant throughout the reaction process?
 
2. What is meant by order of a reaction being zero?
 
3. What is the shape of graph between log k vs1/T. What is the relationship between its slope and activation energy (Ea) ?
 
4. For a chemical reaction rate constant k = 5.3 × 10–4mol L–1 s–1.what will be the order of the reaction?
 
5. Express the rate of reaction in terms of disappearance of hydrogen and appearance of ammonia in the given reaction. N2(g) + 3 H2 (g)→ 2NH3 (g)
 
6. For the elementary step of a chemical reaction : A + H2O → Brate = [A]1.
What is the molecularity and order of the reaction.
 
7. Mention one example of pseudo first order reaction.
 
8. For the reaction Cl2(g)+NO (g) → 2NOCl(g),the rate law is expressed as rate =k[Cl2] [NO]2. What is the overall order of this reaction?
 
SA (I) QUESTIONS (2 - MARK QUESTIONS)
 
9. What do you mean by the rate law and rate constant of a reaction? Identify the order of a reaction if the units of its rate constant are
i. L-1mol s-1
ii. Lmol-1 s-1
 
10. A reaction is second order with respect to a reactant A. How is the rate of this reaction altered if the concentration of A is
i. Doubled
ii. Reduced to half?
11. Explain the terms
i. Rate determining step of areaction
ii. Molecularity of a reaction
 
12. iii. The rate constant for a reaction of zero order in A is 0.0030 mol L-1s-1. How long will it take for the initial concentration of A to fall from 0.10M to 0.075 M?
 
13. A first order reaction takes 40 minutes for 30% decomposition. Calculate its t1/2 value.
 
14. Show that for a first order reaction,the time required for half life is independent of initial concentration.
 
15. A reactant has a half life of 10 minutes.
i. Calculate the rate constant for the first order reaction.
ii. What fraction of the reactant will be left after an hour of the reaction has occurred?
 
16. Calculate the rate constant of a reaction at 293 K, given that: Ea=103 KJ/Mol, k=7.87x 10-7s-1, at 273 K,R=8.314 JK-1mol-1
 
17. The graphs (1 and 2) given below are plots of rate of reaction verses concentration of the reaction. Predict the order from the graphs

CBSE Class 12 Chemistry Chemical Kinetics Question Bank Set B 1

 
SA (II) QUESTIONS (3- MARK QUESTIONS)
 
17. For a decomposition reaction, the values of rate constant k , at two different temperatures are given below.
K1=2.15x10-8Lmol-1s-1 at 650 K , K2=2.39 x10-7Lmol-1s-1 at 700 K Calculate the value of activation energy for this reaction R=8.314JK-1mol-1
 
 
18. Consider the reaction 2A+B → C+ D
Following results were obtained in experiments designed to study the rate of reaction.

CBSE Class 12 Chemistry Chemical Kinetics Question Bank Set B 2

i. Write the rate law for the reaction.
ii. Calculate the value of rate constant for the reaction
iii. Which of the following possible reaction mechanisms is constant with the rate law found in (i)
 
I. A+B → C+ E (slow) A+E → D (fast)
II. B → C+ E (slow) A+E→ F (fast)
A+F→ D (fast)
 
19.. Explain the following :
i. A lump of coal burns at moderate rate in air while coal dust burns explosively.
ii. Average rate of reaction does not give the true picture of the reaction.
iii. Reactions of high molecularity are less in number.
 
20. i. Write four points of difference between order and molecularity of a reaction.
ii. List four methods for determination of order of reactions?
 
21. The decomposition of PH3 proceeds according to the following equation.
4PH3(g) → P4(g)+6 H2(g)
 
It is found that the reaction follows the following rate equation, Rate =k [PH3].The half life of PH3 is 37.9 s at 120 oC.
i. How much time is required for ¾ th of PH3 to decompose?
ii. What fraction of the original sample of PH3 remains behind after 1 minute?
 
LONG ANSWER QUESTION (5- MARK QUESTION)
 
22. i. Defineelementary reaction in a process.
ii. State the role of activated complex in a reaction and state its relation with activation energy.
iii. H2O2 (aq) decomposes to H2O(l) and O2 (g) in a reaction that is of first order in H2O2 and has a rate constant K=1.06 x10-3min -1.
a) How long will it take 15% of a sample of H2O2 to decompose?
b) How long will it take 85% of a sample of H2O2 to decompose?

 

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Unit 3 Chemical Kinetics Practice Sheet and Solutions for Class 12 Chemistry

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