Question

Assertion : Water in liquid state is more stable than ice at room temperature.
Reason : Water in liquid form has higher entropy than ice.

• A. If both assertion and reason are true and reason is the correct explanation of the assertion
• B. If both assertion and reason are true but reason is not the correct explanation of the assertion
• C. If assertion is true, but reason is false
• D. Both assertion and reason are false statements

Answer 1

Answer: (A)

At room temperature water is more stable because ice will tend to melt at room temperature.
The change in entropy of the system during the phase change is, in this case, given by the heat absorbed by the ice divided by its temperature:
$\Delta S=\frac{Q}{T}=\frac{mL}{T}$ which is positive.
This shows that the entropy of an amount of ice at $0^{\circ }C$ is less than the entropy of the same amount (mass) of water at $0^{\circ }C$.