Unit # 7… M.C.Qs on Chemical Energetics
1. The
study of energy transformations occurring during a chemical reaction based on
the principle of conservation of energy is called
|
(a)
|
statistics
|
(b)
|
Thermochemistry
|
|
(c)
|
thermodynamics
|
(d)
|
chemical kinetics
|
2. The study of thermal energy changes that occur
during chemical and physical changes is called
|
(a)
|
statistics
|
(b)
|
Thermochemistry
|
|
(c)
|
thermodynamics
|
(d)
|
chemical kinetics
|
3. Thermochemistry
is the study of relationship between heat energy and ………………
|
(a)
|
K.E
|
(b)
|
P.E.
|
|
(c)
|
chemical energy
|
(d)
|
electrical energy
|
4.It
is the ability of a system or energy to produce change
|
(a)
|
K.E
|
(b)
|
P.E.
|
|
(c)
|
energy
|
(d)
|
heat
|
5. 1J
is equal to
|
(a)
|
1kg-m2/sec2
|
(b)
|
1kg-m/sec2
|
|
(c)
|
1kg-m2/sec
|
(d)
|
none of them
|
6. 1
B.T.U (British thermal unit) is equal to
|
(a)
|
1.005 x103 J
|
(b)
|
1.005 x105 J
|
|
(c)
|
1.005 x109 J
|
(d)
|
none of them
|
7. I
KWH is equal to
|
(a)
|
3.6 x103 J
|
(b)
|
2.6x103 J
|
|
(c)
|
1.6 x103 J
|
(d)
|
none of them
|
8.
1 calorie = ………
|
(a)
|
4.184 J
|
(b)
|
41.84 KJ
|
|
(c)
|
0.004182 J
|
(d)
|
|
9. 1
kcal is equal to:
|
(a)
|
4.184x103J (4.184
kJ)
|
(b)
|
2.184x103J (2.184 kJ)
|
|
(c)
|
5.184x103 J (5.184 kJ)
|
(d)
|
All of the above.
|
10. It
is the natural tendency of a system when left to itself to attain the position
of
|
(a)
|
lowest energy
|
(b)
|
highest energy
|
|
(c)
|
same energy as before
|
(d)
|
Intermediate energy
|
11. Chemical
reaction that are accompanied by thermal energy changes with material changes called reaction
|
(a)
|
Exothermic
|
(b)
|
Endothermic
|
|
(c)
|
thermo chemical
|
(d)
|
Non-spontaneous
|
12. The
chemical reaction during which heat is released to surrounding is called
|
(a)
|
Exothermic
|
(b)
|
Endothermic
|
|
(c)
|
Reversible
|
(d)
|
Redox
|
13. In
endothermic reactions, the enthalpy of the product is……… than the enthalpy of
reactant
|
(a)
|
Less
|
(b)
|
more
|
|
(c)
|
Intermediate
|
(d)
|
none of them
|
14. In
exothermic reactions, the enthalpy of the product is…….. than enthalpy of reactant
|
(a)
|
Less
|
(b)
|
More
|
|
(c)
|
Intermediate
|
(d)
|
none of them
|
15.The
chemical reactions during which heat is absorbed from the surrounding are
called
|
(a)
|
Exothermic
|
(b)
|
Endothermic
|
|
(c)
|
Reversible
|
(d)
|
Redox
|
16. The
property that depends upon state of a system is called
|
(a)
|
state function
|
(b)
|
Enthalpy
|
|
(c)
|
entropy
|
(d)
|
internal energy
|
17. Which
one of the following is a state function?
|
(a)
|
pressure
|
(b)
|
enthalpy
|
|
(c)
|
temperature
|
(d)
|
all of them
|
18. A
state function represents
|
(a)
|
Physical state
|
(b)
|
Chemical state
|
|
(c)
|
Thermodynamical state
|
(d)
|
All of the above
|
19. It
is the sum of all the energies of all the atoms, molecules or ions with in a
system
|
(a)
|
bond energy
|
(b)
|
K.E.
|
|
(c)
|
P.E.
|
(d)
|
internal energy
|
20. Bond
energy is also a form of
|
(a)
|
T.E
|
(b)
|
K.E.
|
|
(c)
|
P.E.
|
(d)
|
free energy
|
21. Heat
of reaction………….. upon the physical state of a reactants or products
|
(a)
|
depends
|
(b)
|
does not depend
|
|
(c)
|
Does not rely
|
(d)
|
all of the above
|
22. Heat
of reaction is _______ for different states of same component of the chemical
reaction
|
(a)
|
Different
|
(b)
|
Same
|
|
(c)
|
High
|
(d)
|
Low
|
23. At
what temperature enthalpy changes are measured
|
(a)
|
298 K
|
(b)
|
25°C
|
|
(c)
|
77°F
|
(d)
|
all of them
|
24.The
physical state of a pure substance at 1 atm pressure and 25°C(298 K) is called……… of a substance.
|
(a)
|
standard state
|
(b)
|
normal state
|
|
(c)
|
natural state
|
(d)
|
none of them
|
25. The properties of a system which are
independent of the amount of the amount of material concerned are called
|
(a)
|
physical properties
|
(b)
|
chemical properties
|
|
(c)
|
Extensive properties
|
(d)
|
intensive properties
|
26. Which
one is an intensive property?
|
(a)
|
mass
or mole
|
(b)
|
Volume
|
|
(c)
|
Enthalpy
|
(d)
|
none of them
|
27.Which
one is not an example of intensive properties?
|
(a)
|
Refractive index
|
(b)
|
Surface tension
|
|
(c)
|
Length
|
(d)
|
Temperature
|
28. The
properties of a system which is depend upon the amount of substance present in
the system is called
|
(a)
|
physical
properties
|
(b)
|
chemical properties
|
|
(c)
|
extensive
properties
|
(d)
|
intensive properties
|
29. Which
one is an extensive property?
|
(a)
|
Pressure
|
(b)
|
vapour pressure
|
|
(c)
|
melting
point
|
(d)
|
none of them
|
30. Which
one is an example of extensive properties?
|
(a)
|
Enthalpy
|
(b)
|
Entropy
|
|
(c)
|
Mole or mass
|
(d)
|
all of the above
|
31. The
total heat content of a system at constant pressure is termed as
|
(a)
|
Enthalpy
|
(b)
|
Entropy
|
|
(c)
|
activation
energy
|
(d)
|
none of them
|
32. Enthalpy
is mathematically equal to
|
(a)
|
H = E + PV
|
(b)
|
H = E-PV
|
|
(c)
|
H = E x PV
|
(d)
|
H = E/PV
|
33. For
all …………………. reaction ΔH is negative
|
(a)
|
Exothermic
|
(b)
|
Endothermic
|
|
(c)
|
Irreversible
|
(d)
|
Reversible
|
34. For
all ……………….. reaction, ΔH is positive
|
(a)
|
Exothermic
|
(b)
|
Endothermic
|
|
(c)
|
Slow
|
(d)
|
Fast
|
35. The
enthalpy change in a reaction does not depend on the
|
(a)
|
states
of reactant and product
|
(b)
|
conditions
under which reaction is carried out
|
|
(c)
|
number
of intermediate steps
|
(d)
|
initial
and final states
|
36. The
enthalpy change accompanying the formation of a one mole of a compound from its
element in their standard states at 25°C (298
K) and under 1 atm pressure is called
|
(a)
|
heat
of reaction
|
(b)
|
heat
of sublimation
|
|
(c)
|
standard
heat of formation
|
(d)
|
heat
of formation
|
37. The
symbol for standard heat of formation is
|
(a)
|
ΔH°
|
(b)
|
ΔHf
|
|
(c)
|
ΔHf°
|
(d)
|
ΔH
|
38. The standard enthalpy change accompanied by the
formation of 1 mole of a compound is called
|
(a)
|
ΔH°
|
(b)
|
ΔHf
|
|
(c)
|
ΔHf°
|
(d)
|
ΔH
|
39. The
ΔHf° of CO2 is
|
(a)
|
-394 kJ/mole
|
(b)
|
-494 kJ/mole
|
|
(c)
|
394 kJ/mole
|
(d)
|
-294 KJ/mole
|
40.The
enthalpy change accompanied by the combustion of one mole is called:
|
(a)
|
heat of formation
|
(b)
|
heat of sublimation
|
|
(c)
|
heat of neutralization
|
(d)
|
heat of combustion
|
41. Negative
enthalpy changing of a chemical reaction means that reaction is
|
(a)
|
Exothermic
|
(b)
|
Endothermic
|
|
(c)
|
Reversible
|
(d)
|
Irreversible
|
42. The
conversion of graphite into diamond is
|
(a)
|
Exothermic
|
(b)
|
Endothermic
|
|
(c)
|
Reversible
|
(d)
|
None of them
|
43. If
the heat content of B is greater than that of A, the reaction: A = B is
|
(a)
|
Exothermic
|
(b)
|
Endothermic
|
|
(c)
|
Spontaneous
|
(d)
|
Instantaneous
|
44. Energy
can neither be created nor be destroyed but it may transferred and transformed
from one form to another form this is known
as
|
(a)
|
law of conservation of mass
|
(b)
|
law of conservation of momentum
|
|
(c)
|
law of conservation of energy
|
(d)
|
All of the above.
|
45. The
law of conservation of energy is also called
|
(a)
|
First law of thermodynamics
|
(b)
|
2nd law of thermodynamics
|
|
(c)
|
3rd law of thermodynamics
|
(d)
|
none of the above
|
46. The
change in internal energy is the sum of heat exchanged and work done on or by
the system. This is the statement of
|
(a)
|
Hess’s law of constant heat
summation.
|
(b)
|
Faraday’s laws of electrolysis.
|
|
(c)
|
First law of thermodynamics
|
(d)
|
First law of thermochemsitry.
|
47. if q is heat added to the system, W is
work done by the system and ΔE is the change in internal energy,
then according to the 1st law of thermodynamic
|
(a)
|
ΔE = q – W
|
(b)
|
ΔE = q +W
|
|
(c)
|
ΔE = q – PΔV
|
(d)
|
ΔE=q +ΔH
|
48. Work
done is ……… when work is done on the system
|
(a)
|
Positive
|
(b)
|
Negative
|
|
(c)
|
Zero
|
(d)
|
All of them
|
49. Work
done is ……… when work is done by the
system
|
(a)
|
Positive
|
(b)
|
Negative
|
|
(c)
|
Zero
|
(d)
|
all
of them
|
50. ΔE
is positive when system ………… energy
|
(a)
|
Loses
|
(b)
|
Gains
|
|
(c)
|
Releases
|
(d)
|
all
of them
|
51. ΔE
is negative when system ……………. energy
|
(a)
|
Loses
|
(b)
|
Gains
|
|
(c)
|
Releases
|
(d)
|
all
of them
|
52. The
pressure volume work is given by
|
(a)
|
W = -PΔV
|
(b)
|
W = PΔV
|
|
(c)
|
W = P+ΔV
|
(d)
|
W = -P+ΔV
|
53. This
is another form of 1st law of thermodynamics
|
(a)
|
ΔE = q-PΔV
|
(b)
|
ΔE=q+PΔV
|
|
(c)
|
ΔE = q*PΔV
|
(d)
|
ΔE = q/PΔV
|
54. Heat
exchanged at constant volume is equal to
|
(a)
|
ΔH
|
(b)
|
ΔE
|
|
(c)
|
ΔT
|
(d)
|
none of them
|
55. Heat
exchanged at constant pressure is equal to
|
(a)
|
ΔH
|
(b)
|
ΔE
|
|
(c)
|
ΔT
|
(d)
|
none of them
|
56. Hess’s
law deals with
|
(a)
|
rate
of reaction
|
(b)
|
equilibrium
constant
|
|
(c)
|
changes
in heat of reaction
|
(d)
|
Electrolysis
|
57.The
amount of heat evolved or absorbed in a chemical reaction remains the same
whether the reaction takes place in one step or in
several steps. It is the statement of
|
(a)
|
Faraday’s law
|
(b)
|
Hess’s law
|
|
(c)
|
1st law of thermodynamics
|
(d)
|
1st thermochemical law
|
58.
The
heat of reaction is independent of the no of intermediate steps and depends
only on initial and final state of the system. It is the
statement of
|
(a)
|
Faraday’s law
|
(b)
|
Hess’s law
|
|
(c)
|
2nd thermochemical law
|
(d)
|
1st thermochemical law
|
59. Hess’s
law is mathematically stated as
|
(a)
|
ΔE = q – W
|
(b)
|
ΔH = ΔH1 + ΔH2 + ΔH3
|
|
(c)
|
q = q1 + q2 + q3
|
(d)
|
both
b and c
|
60. Hess’s
law is a special case of
|
(a)
|
1st law of thermodynamics.
|
(b)
|
2nd law of thermodynamics.
|
|
(c)
|
Law of conservation of energy.
|
(d)
|
None of the above.
|
61.The
heat of decomposition of compound is numerically equal to heat of formation of compound but of opposite sign. This is the statement of
|
(a)
|
1st law of thermodynamics
|
(b)
|
2nd law of thermodynamics
|
|
(c)
|
2nd thermochemical law
|
(d)
|
1st thermochemical law
|
62. Hess’s
law is also known as
|
(a)
|
Faraday’s law
|
(b)
|
2nd law of thermodynamics
|
|
(c)
|
2nd thermochemical law
|
(d)
|
1st thermochemical law
|
63. Which
one of the following enthalpies is always an exothermic process?
|
(a)
|
Enthalpy of ionization
|
(b)
|
Enthalpy of atomization
|
|
(c)
|
Enthalpy of dissociation
|
(d)
|
Enthalpy of neutralization
|
64. In which one of the following neutralization
reactions, the heat of neutralization will be highest?
|
(a)
|
H3CCOOH and NaOH
|
(b)
|
NH4OH and H2SO4
|
|
(c)
|
H3CCOOH and NH4OH
|
(d)
|
HCl and KOH
|
65. Which of the following is the value of heat
of neutralization of a strong acid with strong base?
|
(a)
|
57 kJ
|
(b)
|
13.7 kcal
|
|
(c)
|
5.7 x 104
|
(d)
|
All of the above
|
66. According
to Hess’s law thermal effects of reaction depend on the
|
(a)
|
Initial conditions of the reacting substances.
|
|
(b)
|
Final conditions of the reacting substances.
|
|
(c)
|
Initial and final conditions of the reacting substances.
|
|
(d)
|
Intermediate stages of the reacting substances.
|
67. An
exothermic reactions are one in which reacting substance
|
(a)
|
have more energy than products.
|
|
(b)
|
have less energy than products.
|
|
(c)
|
have the same energy as the
products.
|
|
(d)
|
are at higher temperature than
products.
|
68. Which
one is incorrect regarding exothermic change?
|
(a)
|
ΔH
is negative.
|
|
(b)
|
Enthalpy
of reactant is more than that of product.
|
|
(c)
|
These
reactions are mostly spontaneous.
|
|
(d)
|
Heat
is absorbed.
|
69. An
endothermic reaction is one ion which reacting substances
|
(a)
|
have less energy than products.
|
|
(b)
|
have more energy than products.
|
|
(c)
|
have same energy as the
products.
|
|
(d)
|
Are at lower temperature than products.
|
70.Which
one is incorrect regarding endothermic change?
|
(a)
|
ΔH is positive.
|
|
(b)
|
enthalpy of reactant is less
than that of product.
|
|
(c)
|
these reactions are not occurred
spontaneously.
|
|
(d)
|
Heat is released.
|
71. Which
of the following process is endothermic?
|
(a)
|
the electrolysis of water
|
|
(b)
|
the condensation of steam
|
|
(c)
|
the freezing of water
|
|
(d)
|
Ca + 2H2O = Ca(OH)2
+ H2↑
|
72. Evaporation
of water is
|
(a)
|
an endothermic change
|
|
(b)
|
an exothermic change
|
|
(c)
|
a process where no heat changes
occur
|
|
(d)
|
a process accompanied by
chemical reaction
|
73. Which
of the following is endothermic?
|
(a)
|
CH4
|
+
|
2O2
|
¾¾¾¾®
|
CO2
|
+
|
2H2O
|
|
(b)
|
NaOH
|
+
|
HCl
|
¾¾¾¾®
|
NaCl
|
+
|
H2O
|
|
(c)
|
Fe
|
+
|
S
|
¾¾¾¾®
|
FeS
|
+
|
|
|
(d)
|
CaCO3
|
|
|
¾¾¾¾®
|
CaO
|
+
|
CO2
|
74. Which
of the following is endothermic?
|
(a)
|
C2H5OH
|
+
|
3O2
|
¾¾¾¾®
|
2CO2
|
+
|
3H2O
|
|
(b)
|
2NaOH
|
+
|
H2SO4
|
¾¾¾¾®
|
Na2SO4
|
+
|
2H2O
|
|
(c)
|
2H2
|
+
|
O2
|
¾¾¾¾®
|
2H2O
|
|
|
|
(d)
|
N2
|
+
|
O2
|
¾¾¾¾®
|
2NO
|
|
|
75.Which
is an example of endothermic chemical reaction?
|
(a)
|
C
|
+
|
O2
|
¾¾¾¾®
|
CO2
|
|
|
|
(b)
|
2H2
|
+
|
O2
|
¾¾¾¾®
|
2H2O
|
|
|
|
(c)
|
S
|
+
|
O2
|
¾¾¾¾®
|
SO2
|
|
|
|
(d)
|
C
|
+
|
H2O
|
¾¾¾¾®
|
CO
|
+
|
H2
|
76. Which
is an example of exothermic chemical reaction?
|
(a)
|
C
|
+
|
H2O
|
¾¾¾¾®
|
CO
|
+
|
H2
|
|
(b)
|
H2
|
+
|
I2
|
¾¾¾¾®
|
2HI
|
|
|
|
(c)
|
2KClO3
|
|
|
¾¾¾¾®
|
2KCl
|
|
|
|
(d)
|
2SO2
|
+
|
O2
|
¾¾¾¾®
|
2SO3
|
|
|
77. Which
one of the following is not correct?
|
(a)
|
a system is a portion of matter which is under study
|
|
(b)
|
the environments containing the system are called surroundings
|
|
(c)
|
Universe = system - surroundings
|
|
(d)
|
the condition of a system is called state of a system
|
78. As
increase in internal energy of a chemical system, may lead to which one of the
following
|
(a)
|
The temperature of the system can increase
|
|
(b)
|
A phase change can occur
|
|
(c)
|
A chemical reaction can occur
|
|
(d)
|
all of the above.
|
79. When
does internal energy of the system increase?
|
(a)
|
when a system absorbs energy
|
|
(b)
|
when system rejects energy
|
|
(c)
|
neither absorb nor rejects
energy
|
|
(d)
|
all of the above.
|
80. When
does internal energy of the system decrease?
|
(a)
|
When system works on the surroundings.
|
|
(b)
|
When surroundings work on the system.
|
|
(c)
|
When system absorbs energy.
|
|
(d)
|
all of the above.
|
81. Which
one of the following is the definition of the heat of reaction?
|
(a)
|
It is the amount of heat exchange in a chemical reaction
|
|
(b)
|
It is the heat lost or gained in a chemical reaction
|
|
(c)
|
It is the enthalpy change in a chemical reaction.
|
|
(d)
|
all of the above.
|
82. Which
one of the following statement is not correct?
|
(a)
|
joule is the SI unit of heat
and energy
|
|
(b)
|
1joule is the energy expended
when a force of one Newton acts over a distance of 1 meter
|
|
(c)
|
1 J = 1 N-cm (1kg-cm2/sec2)
|
|
(d)
|
1cal = 40184
J and 1J = 0.239 cal
|
key? of this test M.C.Qs on Chemical Energetics ........... Unit # 7
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