The entropy of a sample of h2o increases as the sample changes from a
(1) gas to a liquid (3) liquid to a gas
(2) gas to a solid (4) liquid to a solid

The correct answer is option 3.

Explanation:

Entropy is defined as the measure of degree of randomness or uncertainty in a system.

It increases whenever the particles move randomly.

In solid state, the particles are orderly arranged and entropy is minimum. In liquid state, the particles are less orderly arranged than solid and entropy increases. In gaseous state, the particles are randomly arranged and hence, the entropy is maximum in this state.

Therefore, whenever there is conversion of solid to liquid to gas, the entropy will increase.

Hence, the correct answer is option 3.