CHEMISTRY CH#11 (VOL-1) REACTION KINETICS
CHEMISTRY CH#11 (VOL-1) REACTION KINETICS
1. Which one of the following correctly
represents the units of the rate constant, k for a first order reaction?
(a) S-1 (b) mol dm-3
s (c) mol dm-3 s
(d) mol-1 dm3 s
2. When a reaction
occurs in many steps than the slowest step is
(a) Mechanism step (b) Rate
determining step
(c) Enthalpy
determining step (d) None of the above
3. Decomposition of
Ozone take place according to the following equation
Rate equation for the reaction is
Rate k = 
What is the order of the reaction?
(a) 3 (b) Zero (c) 2 (d)
1
4. Half life period
of a first order reaction is in independent of
(a) Initial
concentration of the compound (b)
Conditions of temperature
(c) Presence of
catalyst (d)
All of the above
5. Dilatometer method
is useful for the reaction that involve
(a) Ionic species (b) Where reactant absorb
U.V visible or infrared radiation
(c) Small volume changes in
solutions (d) Change in refractive
indice
6. The energy of activation of forward reaction is less than that of
backward reaction in
(a) Endothermic reactions (b) Exothermic
reactions
(c) Isothermic reaction (d) None of the
above
7. A catalyst
(a) Changes equilibrium position
(b) Increases the rate of forward reaction
and decreases the rate of reverse reaction
(c) Increases the rate of forward reaction
(d) Increases the rate of both forward and
reverse reactions
8. Poisoning of a catalyst may be temporary or permanent. In permanent
poisoning
(a) Catalyst reacts with reactant (b) Catalyst reacts with
product
(c) Catalyst reacts with the poison (d) Physical state of catalyst
changes
9. Indicate the enzyme which catalyses the following reaction
(a) Zymase (b)
Invertase (c) Urease (d) Diastase
10. In zero order reaction, the
rate is independent of
(a) Temperature of reaction (b) Concentration of reaction
(c) Concentration of products (d) None of these
11. The rate of reaction
(a) Increases as the
reaction proceeds (b) Decreases as the reaction proceeds
(c) Remains the same as the reaction
proceeds (d) May decrease or increase
as the reaction proceeds
12. The unit of the rate
constant is the same as that of the rate of reaction in
(a) First order reaction (b) Secondary
order reaction
(c) Zero order reaction (d) Third order
reaction
13. The rate equation for a
reaction is Rate = k[A]. What are the units of k
(a) S-1 (b) mol dm-3 (c) mol dm-3 s-1 (d)
mol-1dm3s-1
14. Photosynthesis a
photochemical reaction has order of reaction
(a) 0 (b)
1 (c) 2 (d)
Fractional order
15. Collision theory explains
(a) Rate of reaction (b) Order of
reaction (c) Molecularity of reaction (d) All of these
16.
Hydrolysis of ethyl-acetate (ester) has order of reaction
(a) 0
(b) 1 (c) 2 (d) 3
17. The unit of rate constant k
is mol-1 dm3 s-1 for a chemical reaction the
order of reaction is
(a) 0
(b) 1 (c) 2 (d) 3
18. The decolourization of KMnO4
by acid is catalyst by Mn2+ ions. This is an example of
(a) Chemo-catalyst (b) Auto-catalysis (c) Inhibitor (d) Poisoning of catalysts
19. Catalyst changes
(a) Enthalpy of reaction (b) Enthalpy of
reactants
(c) Enthalpy of products (d) Enthalpy of none
20. Which statement is true
about the order of reaction?
(a) Order of reaction
must be in whole number and not in fraction
(b) Order of reaction increases by
increasing temperature
(c) Order of reaction can only be
determined by an experiment
(d) Order of reaction can be determined
from a balance equation only
21. Which one of the following
statements is incorrect?
(a) Enzymes are protein in nature (b) Enzymes are
catalyst
(c) Enzymes can catalyst any reaction (d) Urease is an enzyme
22. Which
one of the following statements about catalysed and uncatalysed pathways of a
reactions correct?
(a) ∆H
of catalysed reaction is greater than uncatalysed reaction
(b) ∆H
of catalysed reaction is less than uncatalysed reaction
(c) ∆H
of both catalysed and uncatalysed reactions are same
(d) Activation energy of catalysed
reaction is greater than uncatalysed reaction
23.
Which statement about K = Ae-Ea/RT is incorrect?
(a) It is Arrheniusm equation (b) It is
equation of straight line
(b) Temperature do not effect the
reaction rate (d) Reaction rate
increases by increasing temperature
24.
The slope of the arrhenius equation can be represented as
(a) 
(b) 
(c) 
(d) 
(b) (c) (d)
25.
The slope of graph between concentration of reactants and products w.r.t time
is the steepest at the
(a) Beginning (b)
In the correct (c) At the end (d) None is true
26.
When line of graph between concentration and time in a chemical reaction in
horizontal, it means
(a) Reaction is moving with speed (b)
Reaction is proceeding slowly
(c) Reaction is approaching to and end (d) Reaction is complete and
has stopped
27.
At beginnings of a reactions, instantaneous rate is than average rate
(a) Small (b) Smaller (c)
Higher (d) Medium
28.
The value of specific are constant “K” changes with
(a) Pressure (b) Volume (c) Temperature (d) Catalyst
29.
Rate = K [N2O5] has order of reaction
(a) First order (b) Pseudo first order (c) Second order (d) Third order
30.
The disintegration of U92235
(a) 24 minutes (b) 7.1 x 108(7.10)years (c) 48 minutes (d) 9.1 x 108 years
31.
One kg of uranium (92235U) will decompose into half in
million yearas
(a) 710 (b)
355 (c) 720 (d) 360
32.
A specie in which is not mentioned in balanced equation is
(a) Reaction intermediate
(b) May exist with normal bonds and can
be isolated under some specific conditions
(c) Has temporary existence and
unstable (d) Above all correct
33. Order
of reaction is measured by drawn a
(a) Prependicular (b) Tangent (c) Parallel (d) All
34. log
K = + log has independent
variable
+ log has independent
variable
(a) R (b)
log K (c) T (d)
log A
35.
KC/O3 decomposition speeds up in the presence of catalyst
(a) Platinium (b) CuCl2
(c) MnO2 (d)
NO
36. Decomposition
of H2O2 is done in the presence of catalyst
(a) H3O (b) Pt (c) Ni (d) V2O5
37. Sugar solution hydrolyses to glucose
and fructose in the presence of enzyme
(a) Urease (b) Invertase (c)
Zymase in yeast (d) None
38. Enzyme has
(a) Active cites (b) Specific in nature (c) Work at
specific pH (d) All
39. Enzymes are
(a) Catalyst (b) Complex protein
molecules (c) Present in living organisms (d) All
40. The poisons for metallic catalysts are
(a)
Sulphur (b) Arsenic (c)
Compounds of sulphur and arsenic both (d) All
CHAPTER # 11 (ANSWER
KEY)
|
1
|
a
|
11
|
b
|
21
|
c
|
31
|
B
|
|
2
|
b
|
12
|
c
|
22
|
c
|
32
|
B
|
|
3
|
d
|
13
|
a
|
23
|
c
|
33
|
c
|
|
4
|
a
|
14
|
a
|
24
|
c
|
34
|
c
|
|
5
|
c
|
15
|
a
|
25
|
a
|
35
|
d
|
|
6
|
b
|
16
|
b
|
26
|
d
|
36
|
|
|
7
|
d
|
17
|
c
|
27
|
c
|
37
|
|
|
8
|
c
|
18
|
a
|
28
|
c
|
38
|
D
|
|
9
|
c
|
19
|
d
|
29
|
a
|
39
|
D
|
|
10
|
b
|
20
|
c
|
30
|
b
|
40
|
D
|
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