Question

Identify the correct statements from the following:
I) Work is a path function.
II) Enthalpy is an extensive property.
III) Lattice enthalpy of ionic compounds can be obtained from Born–Haber cycle.

• A. I only
• B. I, III only
• C. II, III only
• D. I, II, III

Hint:

State functions depend only on the initial and final states, while path functions like work and heat depend on the path. Extensive properties vary with quantity of matter.

Answer 1

The Correct Option is D

Step 1: Analyze each statement. Statement I: True. 
Work depends on the path taken and not just the initial and final states, so it is a path function. 
Statement II: True. 
Enthalpy is proportional to the amount of substance, hence it is an extensive property. 
Statement III: True. 
Lattice enthalpy can be determined using the Born–Haber cycle by applying Hess's law. 
Conclusion: All three statements are correct.