Match the following process with entropy change:

Reaction Entropy change
A. A liquid vaporizes 1.  S=0
B. Reaction is non-spontaneous at all temperatures and H is positive 2.  S=positive
C. Reversible expansion of an ideal gas 3.  S=negative

Codes:

A B C
1. 2 3 1
2. 1 2 3
3. 1 3 2
4. 3 2 1
Hint: Gas has high entropy than liquid 
A. When a liquid vaporises, i.e., liquid-vapour, entropy increases i.e., S=positive
B. When H=positive, i.e., energy factor opposes. The process is non-spontaneous at all temperatures if entropy also
opposes the process, i.e., S=negative
C. In the reversible expansion of an ideal gas, the system remains in equilibrium at every stage. Hence, S=0