Entropy MCQ - Practice Questions with Answers

ENTROPY

It is a thermodynamic state quantity which is used to measure disorder or randomness of the molecules in a system The disorder or randomness in a system is measured in terms of entropy (S). The absolute value of 'S' is not determined so mostly change In entropy S is measured.

Randomness  Entropy

It is a state function that depends only on the initial and final state of the system that is, it is independent of the path used in going from the initial to the final state.

For a general chemical reaction at 298K and 1 atm:

It is an extensive property and a state function that depends on state variables like T, P, V and n which govern the state of a system.

Entropy and Temperature

Entropy increases with the increase of temperature as it is associated with the molecular motion which Increases with the increase of temperature due to Increase m the average kinetic energy of the molecules. The entropy of a perfectly ordered Crystalline substance is taken as zero at Zero Kelvin (0K) . It is third law of Thermodynamics. However in case of N₂O, NO, LO, Solid CI₂ etc. the value of entropy is not found to be zero at O Kelvin also.