Free Enthalpy MCQs with Answers
45 Enthalpy MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Enthalpy is the heat content of a system measured at constant pressure, and its change indicates whether a reaction or physical process is endothermic or exothermic. The topic covers state functions, enthalpy diagrams, standard enthalpy of formation, combustion and neutralisation, and the relationship between ΔH and internal energy change.
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45 questions · page 3 of 3
- A. Constant Volume
- B. Constant Pressure and volume
- C. Variable pressure
- D. Constant pressure
Explanation: Enthalpy is a thermodynamic state function that represents the internal energy of a system plus the product of pressure and volume.
Correct answer: Constant pressure- A. 0.1
- B. 1.0
- C. 29.8
- D. Zero
Explanation: The correct answer is Zero. In thermodynamics, the standard enthalpy of formation for an element in its most stable form at 1 atm pressure…
Correct answer: Zero- A. △H = q + P△V
- B. △H = △E- P△V
- C. △H = △E + P△V
- D. △H = q - P△V
Explanation: The change in enthalpy, ∆H, at constant pressure is equal to the sum of the heat absorbed or released, q, and the pressure-volume work…
Correct answer: △H = q + P△V- A. Endothermic
- B. Exothermic
- C. Spontaneous
- D. Non spontaneous
Explanation: When the enthalpy of the reactants is greater than the enthalpy of the products, it means that the reaction releases more energy than it…
Correct answer: Exothermic- A. 𝚫H=𝚫E +P𝚫V
- B. 𝚫H=P𝚫V
- C. 𝚫H=𝚫E
- D. 𝚫H=0
Explanation: Option C is correct as ΔH=ΔE+PΔV and for a process involving solids and/or liqiuds, ΔV≅0. Therefore, 𝚫H=𝚫E.
Correct answer: 𝚫H=𝚫E