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10) Why is the heat evolved in neutralization of HF is highest?
a) Due to low hydration energy of F- ion.
b) Due to high hydration energy of F- ion.
c) HF is a strong acid.
d) None of these.
ANSWER : Due to high hydration energy of F- ion.
11) Which of the statement is correct for strong acids and strong bases?
a) Magnitude of heat of hydration is high.
b) Magnitude of heat of ionisation is low.
c) Almost all mole get ionised.
d) All of these.
ANSWER : All of these.
12) Which is a type of kinetic energy?
a) Intermolecular energy.
b) Nuclear binding energy.
c) Intramolecular energy.
d) None of these.
ANSWER : None of these.
13) The process of conversion of solid into vapour directly is known as:
a) Sublimation.
b) Fusion.
c) Vaporization.
d) Evaporation.
ANSWER : Sublimation.
14) Which phenomenon is observed when the door of refrigerator is kept open
and as a result the temperature of air in the room increases?
a) Isothermal process.
b) Adiabatic process.
c) Both a and b.
d) Reversible process.
ANSWER : Isothermal process.
15) A gas enclosed in a cylinder of cross–sectional area 350 cm2 expands
against constant pressure of 1.5 atm. The piston moves 5cm up the work done in
lit–atm is:
a) – 2625.
b) – 2.625
c) – 3.5.
d) – 3500.
ANSWER : – 2.625
16) The first law of thermodynamics is also known as:
a) Law of conservation of mass and energy.
b) Law of conservation of mass.
c) Law of mass action.
d) Law of conservation of energy.
ANSWER : Law of conservation of energy.
17) Hess’s law of constant heat summation states that:
a) ΔH is a state function.
b) ΔH is a path function.
c) Change in enthalpy remains the same depending upon the path used.
d) None of these.
ANSWER : ΔH is a state function.
18) According to Kirchoff’s equation factor what affects the heat of
reaction is:
a) Concentration.
b) Volume.
c) Pressure.
d) Temperature.
ANSWER : Temperature.
19) Enthalpy change at constant volume is expressed as:
a) ΔH = ΔE + ΔnRT.
b) ΔH = ΔE – PΔV.
c) ΔH = ΔE.
d) ΔE = ΔH + PΔV.
ANSWER : ΔH = ΔE.
20) Which of the following is correct about Isothermal process?
a) W = ΔE.
b) ΔH ≠
0.
c) ΔPV ≠
0.
d) q = -W.
ANSWER : q = -W.
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