Chemical Kinetics involve the study of rates of chemical reactions. This also includes the reaction pathways and the mechanism of the reaction. The factors that affect the rate of a reaction, the effect of change of concentration on the rate of the reaction and the order of the reaction are also studied well in this chapter.
Download Class 12 Chemistry Worksheet on Chapter 4 Chemical Kinetics Set 3 PDF.
CBSE Class 12 Chemistry Chapter 4 Chemical Kinetics Worksheet – Set 3
Q-1: In the Arrhenius plot, the intercept of the plot is equivalent to
a.) -Ea/R
b.) log10a
c.) ln K
d.) ln A
Q-2: For the reaction 3A → 2B, the reaction rate given by +d[B]/dt is equal to:
a.) +2d[A]/dt
b.) -d[A]/3dt
c.) -2d[A]/3dt
d.) -3d[A]/2dt
Q-3: DDT decomposes when it comes in contact with water. The half-life period of DDT is 10 years. Calculate the time required for its 99% decomposition.
Q-4: For the zeroth order reaction, the unit of rate constant is ____.
a.) mol-2 L2 s-1
b.) s-1
c.) mol-1 L s-1
d.) mol L-1 s-1
Q-5: Give reason for the following:
Coal does not burn itself in air. However, once the burning is initiated by a flame, the coal keeps burning.
Q-6: The Activation energy of a chemical reaction depends on ____.
a.) the nature of the reactants
b.) temperature
c.) concentration of reactants
d.) collision frequency
Q-7: Why does the equilibrium constant remain unchanged even when a catalyst is used for the reaction?
Q-8: Differentiate between the order and the molecularity of a reaction.
Q-9: The time taken by first order reaction to get completed to its 90% is (approximate value):
a.) 1.1 times its half-life
b.) 2.2 times its half-life
c.) 3.3 times its half-life
d.) 4.4 times its half-life
Q-10: Give the general expression for the amount of substance left after “n” half-lives.
Q-11: Identify the order from the below given rate constants:
(a.) k = 2.3 x 10-5 L mol-1 s-1
(b.) k = 3.1 x 10-4 s-1
Q-12: Given the rate constant of a first order reaction is 60 s-1, determine the time required to reduce the reactant to 1/16th of its initial concentration.
Q-13: The first order for the following decomposition reaction of nitrogen pentoxide (N2O5) in carbon tetrachloride has a rate constant 4.2 x 10-4 s-1. Calculate the rate when the concentration of N2O5 will be 1.25 mol L-1.
N2O5 → 2NO2 + ½ O2
Q-14: Find the half-life of a first order reaction for which the value of rate constant is 7.39 x 10-5 s-1.
Q-15: For the reaction: 2A + B → A2B, the concentration of A is doubled and that of B is halved. The rate of reaction will:
a.) increase 4 times
b.) decrease 4 times
c.) increase 2 times
d.) decrease 2 times
Q-16: What is the reaction profile?
Q-17: The reaction that will end in finite time is
a.) zero order reaction
b.) first order reaction
c.) second order reaction
d.) third order reaction
Q-18: Why does the cooking of food in an open vessel take more time on hilly areas?
Q-19: Can the activation energy for any reaction be zero?
Q-20: What does the catalyst do to the free energy change (ΔG) of a reaction?
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