Entry Test Preparation 2015, Chemistry BOOK 1
REACTION KINETICS
1. 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
2. With
increase of 10oC the rate of reaction doubles. This increase in the
rate of reaction is due to.
(a) decrease in activation energy of
reaction.
(b) decrease in the number of
collisions b/w reactants molecules
(c) increase in activation energy of
reactants.
(d) increase in number of effective
collisions
3. The rate of reaction between two
specific time intervals is called.
(a) instantaneous rate (b) average rate (c) specific rate (d)
ordinary rate
4. The sum of the exponents of the conc.
Terms in the rate equation is called.
(a) rate of reaction (b) order of reaction (c) specific rate constant (d) average rate
5. Photochemical reaction usually has
order.
(a) one (b) zero (c)
two (d) three
6. When the rate of reaction is entirely
independent of the conc. Of reactants molecule then order of reaction is.
(a) Zero (b) first (c)
second (d) third
7. When a reaction occurs in many steps
then the slowest step is called.
(a) main step (b)
enthalpy determining step.
(c) mechanism
determining step (d)
rate determining step
8. Spectrophotometry is applied for rate determination when.
(a)
reactants or product absorb U.V. &
I.R. light.
(b)
reaction involve ion
(c)
reaction involve change in volume
(d)
none of above
9. The unit of rate constant for 2nd order reaction
will be:
(a)
moldm-3s-1 (b) mol-1L-1s-1
(c) s-1 (d) mol L-1
10. The unit of slope in Arrhenius equation is:
(a)
Joule (b) Pascal (c) kelvin (d) No unit
11. The rate equation for a reaction 2A + B à products is rate = k [A]2/3 [B]1/3
(a)
Zero (b) 1 (c) 1/3 (d) 2/3
12. Optical rotation method is used when
(a)
Reactions involving absorption of I.R or U.V. (b)
Reactions involving ions
(c)
Reactions involving volume change (d)
Change of optical activity
13. In the hydrolysis of CH3COOC2H5
the acid produce act as:
(a)
inhibitor (b) catalyst (c) auto catalyst (d) none of above
14. The factors which affect rate of reaction.
(a)
nature of reactants (b)
surface area (c) light (d) all of above
15. Arrehenius equation describe the effect of.
(a)
temperature on rate of reaction (b)
volume on rate of reaction
(c) pressure on
rate of reaction (d)
all of above
16. The reaction rate may be measure by.
(a)
physical method (b) Chemical method (c) Both a & b (d) None
17. By the use of catalysis the energy of activation is.
(a)
Decreased (b) Increased (c) Not affected (d) None
18. If a reactant or product of a reaction
absorbs radiation, then physical method for determining the rate of reaction
is.
(a) Spectrometry (b)
Refractrometry
(c) Conductivity
measurement (d)
Optical method
19. If there is volume change during a
reaction, then rate of this reaction is determined by.
(a) Dilatometric method (b)
Spectrometry
(c) Conductivity method (d) Optical
rotation method
20. In the hydrolysis of ethyl acetate, the
progress of reaction is determined by measuring the concentration of CH3COOH
at definite time intervals by.
(a) Measuring PH (b)
Measuring density
(c) Titration against
standard NaOH (d) Titration against standard KMnO4
solution
21. For chemical reaction to take place the
particles must have sufficient energy for the effective collision, the energy
is called.
(a)
Average energy (b) Activation energy (c) Potential energy (d) Collision energy
22. Reactant reach the potential energy hill
to form the products. This potential energy hill is called.
(a) Activated complex (b) Average
energy
(c) Instant aqueous energy state (d) Ionization energy
23. The reaction with zero activation energy will occur.
(a) Rapidly (b) Very slowly (c)
Moderately (d) Without products
24. When we perform the same reaction by
taking two different initial concentrations of a reactant for a second order
reaction, then.
(a) Reaction becomes exothermic (b) Energy of activation is
different
(c) Mechanism of reaction is changed
(d) Half life period is changed
25. Half life period of a reaction is
inversely proportional to the initial concentration of the reactant, then order
of reaction is.
(a) Third order (b) Second order (c) First order (d) Zero order
26. Al foil reacts moderately with NaOH on
warming producing H2 gas but this reaction is rapid of powered Al
treated with even cold NaOH it is due to.
(a) Increased surface area of
reactants (b) Le-Chatliers
principle
c) Common ion effect (d)
Temperature difference
27. Which statement about Arrhenius equation
is incorrect.
(a) Factor A called Arrhenius
constant depend upon collision frequency of reactants.
(b) Rate of reaction increase by
increasing temperature.
(c) Rate constant k is increased
(d) Activation energy is decreased
by rise in temperature.
28. A catalyst increases the rate of chemical
reaction but remain unchanged because.
(a) It increase the temperature (b) It increases the
surface area
(c) It increases the rate constant (d) It decreases the energy
of activation
29. Catalysis in which catalyst and reactants
are in the same phase is called as:
(a) Homogeneous catalysis (b) Heterogeneous
catalysis
(c) Both of the above (d) None of
the above
30. Hydrogenation of vegetable oil is
accelerated by Ni. The Activity of Ni is increased by a promoter or activator
which is.
(a) Na and K (b) Na and Hg (c)
Hg and Zn (d) Cu and Te
31. Complex protein molecules which catalyses
the organic reaction in the living cells are called as:
(a) Living organism (b) Enzymes (c)
Viruses (d) Bacteria
32. The catalytic activity of enzymes is
greatly enhanced by.
(a) Temperature (b)
Increasing PH
(c) Light (d)
Presence of co-enzyme or activator
33. Which statement about Arrhenius equation is incorrect?
(a)
Rate of reaction increase with increasing temperature
(b)
Activation energy decreases by rise in temperature
(c)
K is rate constant
(d)
A is Arrhenius constant depends upon collision frequency
34. The value of activation energy from graph is:
(a)
Slope x 2.303 R (b) 1/ Slope (c) Slope (d) Slope x R
35. Which of the following statement about catalyst is true?
(a)
Always decreases activation energy (b)
Always increases rate of reaction
(c)
Both (a) and (b) (d)
None
36. Metals which easily react with acid should fulfill which of
the following statements?
(a)
Less oxidation potential as compare to hydrogen
(b) More oxidation
potential as compare to hydrogen
(c) Less
reduction potential as compare to hydrogen
(d) Both (b) and
(c)
37. Which of the following reactions is not feasible according to
the electrochemical series?
(a)
2NaCl + K 
2KCl + 2Na (b)
2KF + Cl2 2KCl + F2
(c)
2KBr + Cl2 2KCl + Br2
(d) 2Kl + Br2
2KBr + I2
38. When Mg is added in aqueous solution of CuSO4 then colour
discharge this indicates that
(a)
Mg is present higher in electrochemical series
(b)
Mg is more reducing agent as compare to Cu
(c)
Mg has less reduction potential as compare to Cu
(d)
All
39. Which of the following reactions indicates homogeneous
catalysis?
(a) 4HCl +
O2 
2H2O
+ Cl2 (b) 2SO2
+ O2 
2SO3
(c) 4NH3
+ 5O2 
4NO + 6H2O
(d) CH3COOC2H5+H2O
CH3COOH+C2H5OH
40. Which one of
the following is heterogeneous catalysis?
(a) HCOOH 
H2O+CO
(b) H2C
= CH2 + H2 
CH3 – CH3
(c) CH3COOC2H5+H2O 
CH3COOH+C2H5OH
(d) 2KClO3
2KCl+3O2
41. Which of the
following is correct?
(a) C2H5OH
C2H4+H2O (b) C2H5OH
CH3CHO+H2
(d) C2H5OH C2H4 + H2O (d)
None
42. If for a reaction, half-life period is
independent of the concentration of the reactants, then the reaction is:
(a) 3rd
order (b) 2nd
order (c) Zero order (d) None
43. The unit of
rate constant and rate of the following reaction is same:
(a) 3rd
order (b) 2nd
order (c) Zero order (d) 1st order
44. The half life
period for 92U235 is:”
(a) 7.1 x 103 years (b)
7.1 x 108 years
(c) 7.1 x 1014 years (d)
vary with concentrations of 92U235
45. The experimental relationship between a
reaction rate and the concentration of reactants is called:
(a) Order of reaction (b) Rate law (c)
Activated complex (d)
Molecularity
46. When the rate of reaction is entirely independent
of the concentration of reactant molecules then order of reaction is.
(a) Zero (b) Negative (c)
In fractions (d) Psendo first
order
47. The order of reaction NO2+CO 
NO + CO2
(a)Zero (b)One (c)Two (d)Three
48. In the hydrolysis reaction
CH3COOC2H5 + H2O CH3COOH + C2H5OH
The order of reaction is first order
because
(a) Rate is independent of concentration of water since it is in
excess
(b) Rate is independent of concentration of ester since it is in
excess
(c) Rate depends upon the concentration of acid catalyst added
(d) Rate = k[CH3COOC2H3]12
[H2O]1/2
(e)
49. Value of rate constant is specific for a
reaction, the value of k of a reaction changes with
(a) Time (b) Temperature (c)
concentration of reactants (d) Order of
reaction
50. The unit of rate constant k is the same
as that of the rate of reaction is.
(a) First order reaction (b) Second order reaction
(c) Third order reaction (d) Zero order reaction
ANSWERS
(reaction kinetics)
1
|
D
|
2
|
C
|
3
|
C
|
4
|
C
|
5
|
C
|
6
|
D
|
7
|
A
|
8
|
C
|
9
|
D
|
10
|
C
|
11
|
B
|
12
|
C
|
13
|
D
|
14
|
B
|
15
|
A
|
16
|
A
|
17
|
B
|
18
|
D
|
19
|
B
|
20
|
A
|
21
|
B
|
22
|
A
|
23
|
B
|
24
|
B
|
25
|
A
|
26
|
D
|
27
|
B
|
28
|
D
|
29
|
D
|
30
|
D
|
31
|
D
|
32
|
B
|
33
|
D
|
34
|
B
|
35
|
D
|
36
|
A
|
37
|
B
|
38
|
C
|
39
|
B
|
