Chemical Kinetics Test

Chemical Kinetics

This is chemical kinetics Test-03 for CBSE class 12 Chemistry.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
The unit of rate constant for a first order reaction is
  • A
    Mol/L/s
  • B
    $s {– 1}$
    Correct
  • C
    $Mo{l^2}/{L^2}/{s^2}$
  • D
    Mol/L
2
Reaction which takes place in one step is known as
  • A
    Elementary reaction
    Correct
  • B
    Reaction rate
  • C
    Bimolecular reaction
  • D
    Unimolecular reaction
3
Which among the following statement is not true for rate constant of a reaction?
  • A
    Unit of rate constant depend upon the order of reaction
  • B
    Rate constant changes with temperature
  • C
    Rate constant has a definite value at a particular temperature
  • D
    Rate constant depend upon the concentration of the reactants
    Correct
4
Which among the following is an example of pseudo first order reaction?
  • A
    Decomposition of nitrogen pentoxide
  • B
    Dehydration of oxalic acid
  • C
    Decomposition of hydrogen peroxide
  • D
    Acid catalysed hydrolysis of ethyl acetate
    Correct
5
Which among the following is an example of first order reaction?
  • A
    Inversion of cane sugar
  • B
    Decomposition of nitrogen pentoxide
    Correct
  • C
    Acid catalysed hydrolysis of ethyl acetate
  • D
    Formation and dissociation of ozone
6
Which among the following is an example of photochemistry used in our daily life?
  • A
    All of these
  • B
    In inversion of cane sugar
  • C
    In decomposition of hydrogen peroxide
  • D
    In photography
    Correct
7
The ionic reactions are generally very fast because
  • A
    The energy of interaction is between charged ion is greater than between neutral molecules
  • B
    The number of collisions between ions are very large
  • C
    It does not involve bond breaking
    Correct
  • D
    Reactions are highly exothermic
8
In the catalyzed decomposition of benzene diazonium chloride, Half life period is found to be independent of the initial concentration of the reactant. After 10 min, the volume of $N_2$ gas collected is 10 L and after the reaction is complete, it is 50 L. Hence, the rate constant of the reaction(in min $^{– 1}$) is
Question 8 figure 1
  • A
    Option A
    Correct
  • B
    Option B
  • C
    Option C
  • D
    Option D
9
The rate constant of the reaction at temperature 200 K is 10 times less than the rate constant at 400 K. The activation energy of the reaction is
  • A
    1842.4R
  • B
    230.3R
  • C
    460.6R
  • D
    921.2 R
    Correct
10
The minimum amount of energy required by the reacting molecules at the time of collisions in order to produce effective collisions is called
  • A
    Activation energy
  • B
    Threshold energy
    Correct
  • C
    Potential energy
  • D
    Internal energy
11
For the first order reaction, half life is equal to
  • A
    $\frac{{0.693}}{K}$
    Correct
  • B
    $\frac{{\left[ {{R_o}} \right]}}{K}$
  • C
    $\frac{{2.303\left[ {{R_o}} \right]}}{K}$
  • D
    $\frac{{\left[ {{R_o}} \right]}}{{2K}}$
12
The half life periods of a reaction at initial concentration 0.1 mol/L and 0.5 mol/L are 200 s and 40 s respectively. The order of the reaction is
  • A
    2
    Correct
  • B
    $\frac{1}{2}$
  • C
    0
  • D
    1
13
Which among the following is an instantaneous reaction?
  • A
    Precipitation of silver chloride
    Correct
  • B
    Hydrolysis of starch
  • C
    Burning of a log of wood
  • D
    Rusting of iron
14
The half life of a reaction is halved as the initial concentration of the reactant is doubled. The order of the reaction is
  • A
    2
    Correct
  • B
    1
  • C
    0
  • D
    3
15
The substance that slows down the reaction without being consumed is known as
  • A
    Catalysis
  • B
    Hormones
  • C
    Inhibitors
    Correct
  • D
    Positive catalyst