Question

A measure of the degree of disorder of a system is known as
A. Isobaric
B. Isotropy
C. Enthalpy
D. Entropy

Answer 1

Hint:This problem is based on the Second Law of thermodynamics, we know that work entropy varies with heat exchange and temperature, hence, analyze each & every option given with the scientific approach and check which option seems to be more appropriate for the given situation to present the answer with proper explanation.



Complete answer:
We know that the Second Law of Thermodynamics gives an idea of the direction of Heat Transfer in any particular process.
According to the 2nd Law of Thermodynamics, the change in the entropy of the universe, $\Delta {S_{universe}}$ (i.e., system + surrounding) either increases or remains the same in any spontaneous process and mathematically, it can be represented as: -
$\Delta {S_{universe}} = \Delta {S_{system}} + \Delta {S_{surroundings}}$ where $\Delta {S_{universe}} > 0$
where the measure of randomness or molecular disorder of a system is defined as Entropy.
In other words, the measure of thermal energy of a system per unit temperature (unavailable for work done) is also called Entropy. Mathematically,
$\Delta S = \dfrac{Q}{T}$
where $Q = $amount of heat received by the system at temperature $T$.
Thus, A measure of the degree of disorder of a system is known as Entropy.
Hence, the correct option is (D) Entropy.



Thus, the correct option is D.



Note:Since this is a problem of multiple-choice question (theory-based) hence, it is essential that given options must be analyzed very carefully to give a precise explanation. While writing an explanation of this kind of conceptual problem, always keep in mind to provide the exact reasons in support of your explanation.