CHAPTER 7 THERMOCHEMISTRY M.cqs 1st year chemistry
CHAPTER 7
THERMOCHEMISTRY
MCQs
Q.1 Which of the following statements is
contrary to the first law of
thermodynamics?
(a) energy can
neither be created nor destroyed
(b) one form of
energy can be transferred into an equivalent amount of other kinds of energy
(c) in an
adiabatic process, the work done is independent of its path
(d) continuous
production of mechanical work with out equivalent amount of heat is possible
Q.2 The change in heat energy of a chemical
reaction at constant temperature and pressure is called change
(a)
enthalpy change (b) bond energy (c) heat of sublimation (d) internal energy
Q.3 For the reaction NaOH + HCl NaCl + H2O, the change in enthalpy is called as:
(a) heat of
reaction (b) heat of
formation (c)heat of
neutralization (d) heat of
combustion
Q.4 Calorie is equivalent to
(a) 0.4184
J (b)
41.84 J (c) 4.184 J (d) 418.4 J
Q.5 For a given process, the heat change at
pressure (qp) and constant volume (qv) are related to each other as
(a) qp =
qv (b) qp < qv (c) qp > qv (d) qp =1
Q.6 The net heat change in a chemical
reaction is same whether. It is brought about in two or more different ways in
one or several steps. It is known as
(a) Henry’s
law (b) Joule’s principle (c) Hess’s law (d)
Law of conservation of energy
Q.7 Enthalpy of neutralisation of all the strong
acids and strong bases has the same value because
(a)
neutralisation leads to the formation of salt and H2O
(b) strong
acid and bases are ionic substances
(c) acids
always give rise to H+ ions and bases always furnish OH–
ions
(d) the net
chemical change involve the combination of H+ and OH– ions to form water
Q.8 If an endothermic reaction is allowed to
take place very rapidly in the air. The
temperature of the surrounding air
(a) remains
constant (b) increase (c) decrease (d) remain unchanged
Q.9 In endothermic reactions, the heat
content of the
(a)
products is more than that of reactants
(b)
reactants is more than that of products
(c) both
(a) and (b)
Q.10 Hess’s law is also called
(a) first
law of thermodynamics
(b) second law of thermodynamics
(c) first
law of thermochemistry (d) second law of thermochemistry
Q.11 Pressure – volume work is
(a) P V (b) F x d (c) hv
(d) H + p v
Q.12 Kinetic energy of molecules is due to
(a)
rotational energy
(b) vibrational energy (c) translational energy (d) all of these
Q.13 The condition for standard enthalpy change
is
(a) 1 atm
30oC
(b) 1 atm 0oC (c) 1 atm 25oC (d) 760 atm 25oC
Q.14 The unit of enthalpy change is
(a)
calorie (b) joule
(c) volt (d) coulomb
Q.15 The sum of all kinds of a system is ions or
molecules of a system is
(a)
vibrational energy
(b) potential energy (c) kinetic energy (d)internal energy
Q.16 An endothermic reaction is one is which
(a)
enthalpy of reactants and products are same
(b)
enthalpy of products is greater than reactant
(c)
enthalpy of products is lesser than reactants
(d) heat is
evolved from system
Q.17 Bomb calorimeter is used to determine
(a) enthalpy of
solution (b) enthalpy of
atomization (c) enthalpy of combustion (d) enthalpy of neutralization
Q.18 Glass calorimeter is used to determine
(a)
enthalpy of combustion (b)
enthalpy of reaction (c)
pressure–volume work (d)none
of above
Q.19 Born–Haber cycle is used to calculate
(a)
enthalpy of combustion
(b) lattice energy of ionic camps (c) both a and b (d) none of above
Q.20 Born–Haber cycle is an application of
(a) first
law of thermodynamics (b)
second law of thermodynamics (c)first
law of thermochemistry (d) Hess’s
law
Q.21 An exothermic reaction is one in which
(a)
enthalpy of reactants and products are same (b) heat is absorbed by system
(c) enthalpy
of products is greater than reactants (d) enthalpy of reactants is lesser than
products
Q.22 A substance under observation during an
experiment
(a)
surrounding (b)
system (c) state function (d) universe
Q.23 Enthalpy of neutralization is merely Called
(a) heat of
solution (b) heat
of atomization (c) heat of combustion (d)heat of formation of H2O
Q.24 Lattice energy of NaCl is
(a) + 500
kJ (b) – 344 kJ (c) – 776 kJ (d) – 411 kJ
Q.25 Standard enthalpy of Al2O3
cannot be measured because
(a) it does
not catch fire (b) it reacts
with CO2 (c) protective layer of oxide cover the surface (d) none of above
Q.26 Ammonium chloride dissolve in water this
process is
(a)
endothermic process (b)
exothermic process
(c) simple hydration
(d) none of above
Q.27 First law of thermodynamics is represented
as
(a) dE = q +
R T (b) dE
= q + D P (c) E = q
+P (d)E = q +
w
Q.28 Pumping of water uphill is
(a)
spontaneous reaction (b) exothermic reaction (c)
non–spontaneous reaction
(d) endothermic
Q.29 In exothermic reaction dH is
(a) positive (b) negative (c) zero (d) none of above
ANSWERS
Question : 1 2
3 4 5
Answers D
a c c C Question 6 7 8 9 10
Answers c d c c D
Questions: 11 12 13 14 15
Answers: a d
c a d
Questions: 16 17 18 19 20
Answers b c b b d
Questions: 21 22 23 24 25
Answers: c b d c
c
Questions: 26 27 28 29
Answers : a d b
b
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