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The entropy change can be calculated by ...

The entropy change can be calculated by using the expression `Delta S = (q_("rev") )/( T) `. When water freezes in a glass beaker, choose the correct statement amongst the following :

A

`Delta S` (system) decreases but `Delta S` (surroundings) remains the same.

B

`Delta S` (system) increases but tiS (surroundings) decreases.

C

`Delta S` (system) decreases but `Delta S` (surroundings) increases.

D

`Delta S` (system) decreases and `Delta S` (surroundings) also decreases.

Text Solution

Verified by Experts

The correct Answer is:
C
The entropy change can be calculated by using the expression `Delta S = (q_("rev") )/( T)`
When water freezes in a glass beaker, `Delta S` (system) decreases because molecules in solid ice are less random than in liquid water.
However, when water freezes to ice, heat is released which is absorbed by the surroundings. Hence, entropy of the surrounding increases.
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