Thermodynamics and Chemical Energetics AFCAT Questions

AFCAT Chemistry

Thermodynamics and Chemical Energetics MCQ Questions


1.
A reaction in which heat is evolved is called:
A.
Endothermic reaction
B.
Exothermic reaction
C.
Reversible reaction
D.
Photochemical reaction
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ANSWER :
B. Exothermic reaction
2.
A reaction in which heat is absorbed from the surroundings is called:
A.
Exothermic reaction
B.
Spontaneous reaction
C.
Endothermic reaction
D.
Combustion reaction
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ANSWER :
C. Endothermic reaction
3.
For an exothermic reaction, the value of ΔH is:
A.
Positive
B.
Negative
C.
Zero
D.
Infinite
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ANSWER :
B. Negative
4.
For an endothermic reaction, the value of ΔH is:
A.
Negative
B.
Zero
C.
Positive
D.
Cannot be determined
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ANSWER :
C. Positive
5.
Which of the following is an example of an exothermic reaction?
A.
Photosynthesis
B.
Melting of ice
C.
Combustion of methane
D.
Decomposition of CaCO₃
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ANSWER :
C. Combustion of methane
6.
Which of the following is an endothermic process?
A.
Combustion of coal
B.
Burning of LPG
C.
Melting of ice
D.
Rusting of iron
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ANSWER :
C. Melting of ice