61. Strong acids and bases have heat of neutralization around:
A) -57 kJ/mol
B) +57 kJ/mol
C) 0 kJ/mol
D) -100 kJ/mol
Answer: A
62. A reaction with ΔH = 0 is:
A) Endothermic
B) Exothermic
C) Thermoneutral
D) Irreversible
Answer: C
63. The sign of ΔH indicates:
A) Temperature
B) Direction of heat flow
C) Pressure
D) Volume
Answer: B
64. Enthalpy is an extensive property because it depends on:
A) Temperature
B) Pressure
C) Amount of substance
D) Volume only
Answer: C
65. Specific heat is an intensive property because it is:
A) Independent of amount
B) Dependent on amount
C) Dependent on mass
D) Dependent on volume
Answer: A
66. Which process absorbs heat?
A) Condensation
B) Freezing
C) Vaporization
D) Crystallization
Answer: C
67. Which process releases heat?
A) Sublimation
B) Vaporization
C) Condensation
D) Melting
Answer: C
68. The enthalpy of sublimation is:
A) Solid → liquid
B) Liquid → gas
C) Solid → gas
D) Gas → solid
Answer: C
69. Enthalpy change for reverse reaction is:
A) Same
B) Opposite sign
C) Zero
D) Double
Answer: B
70. Hess’s law allows calculation of:
A) Unknown ΔH
B) Temperature
C) Pressure
D) Volume
Answer: A