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40) Exothermic change is observed in:
a) evaporation of liquid.
b) fusion of solid.
c) condensation of liquid.
d) none of these.
ANSWER : condensation of liquid.
41) A -> B, ?H = -1.84 kJ, this means:
a) B cannot be easily formed from A.
b) B can be easily converted to A.
c) A is stable than B.
d) B is stable than A.
ANSWER : B is stable than A.
42) If 1 gm equivalent each of strong acid and strong base react in dil.
solution then:
a) they neutralize incompletely.
b) they neutralize completely.
c) neutralize to evolve minimum heat.
d) both a and c.
ANSWER : they neutralize completely.
43) What happens if an exothermic reaction is reversed?
a) There is no change at all.
b) It becomes an endothermic reaction.
c) It attains equilibrium.
d) None of these.
ANSWER : It becomes an endothermic reaction.
44) The heat of formation of CO2 is – 394.0 kJ. What will be the
heat of combustion of carbon?
a) -46.0 kJ
b) -26.0 kJ
c) -394.0 kJ
d) 394.0 kJ
ANSWER : -394.0 kJ
45) Dil.H2SO4 solution is used for neutralization of
equal volumes of molar KOH and NaOH. X kcal and Y kcals of heat are liberated
respectively. Which of the following is true?
a) x = y
b) x = ½ y
c) x = 0.5 y
d) none.
ANSWER : x = y
46) ……….. helps in cooling a gas when it is subjected to adiabatic
expansion.
a) Energy used in doing work.
b) Loss of kinetic energy
c) Fall in temperature.
d) Decrease in velocity.
ANSWER : Energy used in doing work.
47) Decrease in temperature of the system is observed in:
a) isothermal expansion.
b) adiabatic expansion.
c) isothermal compression.
d) adiabatic compression.
ANSWER : adiabatic expansion.
48) Neon molecule possesses:
a) vibrational as well as translational energy
b) translational energy only.
c) potential as well as translational energy.
d) only potential energy.
ANSWER : potential as well as translational energy.
49) The relation ?H = ?E + P?V is valid for a closed system at:
a) Constant temperature.
b) Constant pressure.
c) Constant temperature and pressure.
d) Constant temperature, pressure and composition.
ANSWER : Constant temperature, pressure and composition.
50) Which among the following is a correct set of intensive variables?
a) Area, dielectric constant, temperature.
b) Specific gravity, heat capacity, pressure.
c) Volume, energy, dipole moment.
d) Refractive index, viscosity, density.
ANSWER : Refractive index, viscosity, density.
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