Question

During vaporisation: I. change of state from liquid to vapour state occurs. II. temperature remains constant. III. both liquid and vapour states coexist in equilibrium. IV. specific heat of substance increases. Correct statements are

• A. I, II and IV
• B. I, III and IV
• C. II, III and IV
• D. I, II and III

Hint:

During phase change, supplied heat changes phase, not temperature.

Answer 1

The Correct Option is D

Step 1: During vaporisation, liquid changes into vapour at constant temperature.
Step 2: Both phases coexist in equilibrium during the phase change.
Step 3: Specific heat is not defined during phase change, so statement IV is incorrect.