Q. Which of the following has the highest enthalpy of formation?
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A.
O2(g)
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B.
H2(g)
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C.
C(s)
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D.
CO2(g)
Solution
CO2(g) has a higher enthalpy of formation compared to the elements in their standard states.
Correct Answer: D — CO2(g)
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Q. Which of the following is a unit of enthalpy?
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A.
Joules
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B.
Calories
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C.
Kilojoules
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D.
All of the above
Solution
Enthalpy can be expressed in Joules, Calories, and Kilojoules.
Correct Answer: D — All of the above
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Q. Which of the following is an example of an endothermic reaction?
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A.
Respiration
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B.
Photosynthesis
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C.
Combustion
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D.
Neutralization
Solution
Photosynthesis is an endothermic process as it absorbs energy from sunlight.
Correct Answer: B — Photosynthesis
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Q. Which of the following reactions has a negative enthalpy change?
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A.
Dissolving NaCl in water
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B.
Photosynthesis
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C.
Respiration
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D.
Melting of ice
Solution
Respiration is an exothermic reaction that releases energy, resulting in a negative enthalpy change.
Correct Answer: C — Respiration
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Q. Which of the following reactions has the highest enthalpy change?
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A.
Dissolving NaCl in water
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B.
Combustion of propane
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C.
Formation of NH3 from N2 and H2
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D.
Sublimation of dry ice
Solution
The combustion of propane releases a large amount of energy, resulting in the highest enthalpy change among the options.
Correct Answer: B — Combustion of propane
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Q. Which of the following statements about enthalpy is true?
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A.
Enthalpy is an extensive property.
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B.
Enthalpy is an intensive property.
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C.
Enthalpy cannot be measured directly.
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D.
Enthalpy is always positive.
Solution
Enthalpy is an extensive property, meaning it depends on the amount of substance present.
Correct Answer: A — Enthalpy is an extensive property.
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Q. Which of the following statements is true regarding enthalpy?
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A.
Enthalpy is a state function
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B.
Enthalpy depends on the path taken
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C.
Enthalpy cannot be measured
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D.
Enthalpy is always positive
Solution
Enthalpy is a state function, meaning it depends only on the initial and final states, not the path taken.
Correct Answer: A — Enthalpy is a state function
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