Thermodynamics and Chemical Energetics AFCAT Questions

AFCAT Chemistry

Thermodynamics and Chemical Energetics MCQ Questions


7.
In an exothermic reaction, the enthalpy of products is:
A.
Greater than reactants
B.
Less than reactants
C.
Equal to reactants
D.
Zero
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ANSWER :
B. Less than reactants
8.
In an endothermic reaction, the enthalpy of products is:
A.
Less than reactants
B.
Equal to reactants
C.
Greater than reactants
D.
Always zero
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ANSWER :
C. Greater than reactants
9.
Photosynthesis is an example of:
A.
Exothermic reaction
B.
Endothermic reaction
C.
Spontaneous reaction at room temperature
D.
Combustion reaction
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ANSWER :
B. Endothermic reaction
10.
Burning of fuels in vehicles releases heat. This is an example of:
A.
Endothermic reaction
B.
Exothermic reaction
C.
Reversible process
D.
Adiabatic process
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ANSWER :
B. Exothermic reaction
11.
Which of the following processes is exothermic?
A.
Sublimation of dry ice
B.
Evaporation of water
C.
Freezing of water
D.
Boiling of water
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ANSWER :
C. Freezing of water
12.
Neutralization of a strong acid with a strong base is:
A.
Endothermic with ΔH ≈ +57.3 kJ/mol
B.
Exothermic with ΔH ≈ -57.3 kJ/mol
C.
Has ΔH = 0
D.
Endothermic with ΔH ≈ -57.3 kJ/mol
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ANSWER :
B. Exothermic with ΔH ≈ -57.3 kJ/mol