In a hydrogen-oxygen fuel cell, combustion of hydrogen occurs to
A. generate heat
B. create potential difference between the two electrodes
C. produce high purity water
D. remove absorbed oxygen from electrode surfaces
Answer: Option B
A. generate heat
B. create potential difference between the two electrodes
C. produce high purity water
D. remove absorbed oxygen from electrode surfaces
Answer: Option B
A. physical change
B. reduction reaction
C. endothermic reaction
D. exothermic reaction
Which law of the thermochemistry introduces the concept of entropy?
A. Second Law
B. Zeroth Law
C. Third Law
D. First Law
Which of the following is a closed system?
A. Jet engine
B. Tea placed in steel kettle
C. Pressure cooker
D. Rocket engine during propulsion
The entropy of perfectly crystalline solid at absolute zero is
A. positive
B. negative
C. Zero
D. not definite
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