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

Read the above assertion and reason and choose the correct option regarding it.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
In an unisolated system, heat may enter into or escape from the system due to which entropy may increase or decrease but for the isolated system we do not consider an exchange of heat, so, in this case, entropy will always increase as the process is spontaneous.

An adiabatic process involves no exchange of heat. We also define an isolated system as having no exchange of heat with the surrounding so it process in an isolated system is adiabatic.

The two statements are independently correct but not co-related.

Hence, option B is correct.

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