Enthalpy-Multiple Choice Questions Quiz

Interactive MCQs on “Enthalpy”:

Solve the following 10 questions: Only one option is correct. Click on the “Submit” button when done. Click on the “embed” button to use this quiz on your website. Click on “WhatsApp” to share this quiz.

Question 1: What does enthalpy represent in a thermodynamic system?

(a) The total energy content of the system
(b) The temperature of the system
(c) The pressure of the system
(d) The volume of the system

Question 2: In an exothermic reaction, the change in enthalpy (∆H) is:

(a) Positive
(b) Negative
(c) Zero
(d) Variable

Question 3: What is the standard state condition for enthalpy (∆H°) changes?

(a) 0°C and 1 atm pressure
(b) 25°C and 1 atm pressure
(c) 0 K and 0 atm pressure
(d) 100°C and 1 atm pressure

Question 4: Enthalpy change (∆H) can be calculated using which equation?

(a) ∆H = ∆U + P∆V
(b) ∆H = ∆U - P∆V
(c) ∆H = Q - P∆V
(d) ∆H = Q + P∆V

Question 5: Which type of reaction involves the transfer of heat to the surroundings and has a positive ∆H?

(a) Exothermic reaction
(b) Endothermic reaction
(c) Reversible reaction
(d) Irreversible reaction

Question 6: Enthalpy change (∆H) is negative for which process?

(a) Melting ice
(b) Evaporating water
(c) Condensing water vapor
(d) Dissolving salt in water

Question 7: The enthalpy of formation (∆H°f) of an element in its standard state is:

(a) Always zero
(b) Always positive
(c) Always negative
(d) Variable depending on the element

Question 8: What is the relationship between the heat of reaction (Q) and the change in enthalpy (∆H) for a reaction occurring at constant pressure?

(a) Q = ∆H
(b) Q = -∆H
(c) Q = ∆H + P∆V
(d) Q = ∆H - P∆V

Question 9: Enthalpy change is an extensive property. What does this mean?

(a) It depends on the pressure of the system.
(b) It depends on the temperature of the system.
(c) It is additive for multiple reactions.
(d) It is independent of the amount of substance.

Question 10: What is the enthalpy of vaporization?

(a) The heat released during a phase change from gas to liquid
(b) The heat required to melt a substance
(c) The heat required to change a substance from a solid to a gas
(d) The heat required to vaporize a substance at its boiling point