B.Sc. First year
Undergraduate degree course Semester second Physical chemistry paper IV
Chapter - Chemical Kinetics
Multiple choice questions
1. Reaction rates can change with
(a) temperature
(b) the
addition of a catalyst
(c) reactant
concentrations
(d) all
of these
2. Reaction rates generally
(a) are
constant throughout a reaction
(b) are
smallest at the beginning and increase with time
(c) are
greatest at the beginning of a reaction and decrease with time
(d) no
such generalisations can be made
3. Which three factors affect the rate of a chemical
reaction?
(a) temperature,
pressure and humidity
(b) temperature,
reactant concentration and catalyst
(c) temperature,
reactant concentration and pressure
(d) temperature,
product concentration and container volume
4. The quantity k in a rate law expression
(a) is
independent of concentration
(b) is
called the Arrhenius constant
(c) is
dimensionless
(d) is
independent of the temperature
5. As the temperature of a reaction is increased, the
rate of the reaction increases because the
(a) reactant
molecules collide with greater energy
(b) reactant
molecules collide less frequently
(c) reactant
molecules collide less frequently and with greater energy
(d) activation
energy is lowered
6. In a series of reactions, which is the
rate-determining step?
(a) the
simplest reaction
(b) the
main reaction involving the major reactant
(c) the
slowest reaction
(d) the
fastest reaction
7. The rate law relates the rate of a chemical reaction
to
(a) the
concentrations of reactants
(b) the
temperature
(c) the
activation energy
(d) the
reaction mechanism
8. Rate laws for chemical reactions are determined
(a) by
examining the coefficients in the balanced chemical equation
(b) from
the equilibrium constant
(c) from
the rates of the forward and reverse reactions of the system at equilibrium
(d) by
experiment
9. To study the rate of a reaction, it is necessary to
(a) identify
the reactants
(b) know
the relative amounts of reactants used
(c) know
the overall chemical equation for the reaction
(d) all
of the above are necessary
10. Why do most chemical reaction rates increase rapidly
as the temperature rises?
(a) the
fraction of the molecules with kinetic energy greater than the activation
energy increases rapidly with temperature
(b) the
average kinetic energy increases as temperature rises
(c) the
activation energy decreases as temperature rises
(d) more
collisions take place between particles so that the reaction can occur
11. The rate constant for a reaction depends upon
each of the following, EXCEPT:
(a) solvent
for solutions
(b) temperature
(c) concentration
of reactants
(d) nature
of reactants
12. The powers in the rate law are determined by
(a) the
principle of detailed balance
(b) the
physical states of the reactants and products
(c) experiment
(d) the
coefficients in the balanced chemical reaction
13. As temperature increases, the reaction rate.....
(a) decrease
than increase
(b) decreases
(c) increases
(d) stays
the same
14. The half-life of a first-order process
(a) depends
on the reactant concentration raised to the first power
(b) is
inversely proportional to the square of the reactant concentration
(c) is
inversely proportional to the reactant concentration
(d) is
totally independent of the reactant concentration
15. According to chemical kinetic theory, a reaction can
occur
(a) if
the reactants collide with the proper orientation
(b) if
the reactants possess sufficient energy of collision
(c) if
the reactants are able to form a correct transition state
(d) all
of the above
16.Which of the following does NOT affect the rate of a
chemical reaction?
(a) enthalpy
of the reaction
(b) concentration
of reactants
(c) temperature
(d) surface
area
17.The change in
concentration of a reactant or product per unit time is called as------- of the
reaction.
(a) rate
(b) rate
constant
(c) half-
life
(d) velocity
18.
The sum of powers of concentrations in the rate law equation is called as
--------- of the reaction.
(a) Molecularity
(b) order
(c) kinetics
(d) rate
19.
zero order reaction is a reaction in which ----
(a) rate
is dependent on temperature
(b) rate
is dependent on concentration of reactants
(c) rate
is independent of concentration of reactants
(d) none
of these
20.
The total number of molecules or atoms participating in a reaction as
represented by the balanced chemical equation is called as---------------
(a) molecularity
(b) order
(c) rate
(d) rate
constant
21.
Which of the following is false about molecularity of a reaction?
(a) it
is always a whole number
(b) it
cannot have zero value
(c) it
is invariant for a chemical reaction
(d) it
is an experimentally determined concept
22. Which of the following is true about
order of a reaction?
(a) it
is a theoretical concept
(b) it
cannot have zero value
(c) it
cannot change with conditions of reaction such as pressure,
temperature, concentration etc.
(d) it
can have fractional value
23.A
reaction in which rate of the reaction is independent of concentration of the
reactants is said to be ----------- order reaction.
(a) zero
(b) first
(c) second
(d) third
24.Molecularity
of a reaction can ---------
(a) be
zero.
(b) be
only integral
(c) be
zero
(d) all
of these
25.The
rate constant of a reaction is 1.65x10-3 min-1. The order
of reaction is
(a) 0
(b) 3
(c) 2
(d) 1
26.The minimum energy required to convert reactants into activated transition state is called -------
activation energy
Arrhenius energy
kinetic energy
internal energy.
27.
The unit of rate constant of a zero order reaction is ---
(a) lit.sec-1.
(b) lit-1.
(c) sec-1
(d) mol.lit-1s
-1
28.
The unit of rate constant for a first order reaction is ----------
(a) conc
(b) 1/sec
(c) mol
(d) mlt
29.For
a first order reaction, half life is independent of -------------
(a) initial
concentration of products
(b) initial
concentration of reactants
(c) temperature
(d) pressure
30.
For a pseudo first order reaction -------- Number of molecules participate in
reaction.
(a) 0
(b) 1
(c) more
than one
(d) none of these
31.The
term ‘A’ in the Arrhenius equation K = A. e-1/RT is ---------
(a) collision
factor
(b) constant
(c) frequency
factor
(d) all
of these
32.Arrhenius
reaction rate theory considers only ------
activation energy of reactants
internal energy of reactants
all
of these
33.The half-life of a first order reaction
-------
(a) depends
on concentration of reactant
(b) does
not depend on concentration of reactant
(c) depends
on pressure
(d) all
of the above
34.
Rate of reaction changes with -----
(a) temperature
(b) addition
of catalyst
(c) concentration
of reactants
(d) all
of these
35.
With increase in temperature, the rate of reaction increases because –
(a) reactant
molecules collide with more energy
(b) reactant
molecules collide less frequently
(c) both
(a) and (b)
(d) activation
energy is lowered
36. Rate laws for chemical reactions are
determined by ---
(a) examining
the coefficients in chemical equation
(b) from
equilibrium constant
(c) temperature
effect
(d) experiments
37.
For a first order reaction it's half-life -------
(a) depends
on initial concentration of reactant
(b) inversely
proportional to concentration of reactant
(c) directly
proportional to concentration of reactant
(d) independent
of initial concentration of reactant
38.
t1/2 for a first order
reaction is 20 sec. The time required for 99.9% decomposition is ------
(a) 400
s
(b) 30
min
(c) 40
s
(d) 199.9
s
39.
The number of years in which a 80 mg of sample of (t17, = 5760 years) will be
reduced to 20 mg is --------
(a) 5760
(b) 11.520
(c) 17,280
(d) 23,040
40.
If the rate of the reaction is equal to the rate constant, the order of the
reaction is ---
(a) 2
(b) 3
(c) 0
(d) 1
41.A
first order reaction has specific rate constant of 2 per minute. The half-life
of the reaction will be --------
(a) 0.347
min
(b) 2
min
(c) 4
min
(d) 0.837
min
42.
The effect of temperature on reaction rate was explained by -------
(a) Lambert
(b) Ostwald
(c) Faraday
(d) Arrhenius
43.
The order of a reaction is determined ----------
(a) theoretically
(b) experimentally
(c) by
Arrhenius equation
(d) all
of these
44.
In a zero order reaction if the concentration of the reactants is doubled, the
rate becomes ---
(a) one
(b) zero
(c) half
(d) twice
45.The
energy of activated complex is -------------- than that of the reactants.
(a) lesser
(b) higher
(c) equal
(d) constant
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1) Mathematical concepts MCQ
2) Gaseous State MCQ
3)Liquid State MCQ
4) Solid State MCQ
5)Chemical kinetics MCQ
6) Catalysis MCQ
7) Colloidal State MCQ
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