Question

Assertion :In an isolated system,the entropy increases. Reason: The processes in an isolated system are adiabatic.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertionn
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertionn

Second law of thermodynamics states that in a closed system $($isolated$),$ unconstrained energy will spontaneously tend to disperse over time from more concentrated forms to can only flow forms$.$ That is ${}^{\prime }hea{t}^{\prime }$ can only flow from hotter to colder and newer that other way around$.$

Since entropy is just measure of the energy dispersion$,$ in units of energy over temperature$,$ entropy must always increase$.$

Hence,

option $\left(A\right)$ is correct answer.