NEET Chemistry First Law Assertion Reason Question
Assertion (A): The change in internal energy of a system is equal to the sum of heat absorbed and work done by the system.
Reason (R): In an isolated system, the internal energy change can occur without heat or work transfer.
Both A and R are true, and R is the correct explanation of A.
Both A and R are true, but R is not the correct explanation of A.
A is true but R is false.
A is false but R is true.
Correct Answer
Detailed Explanation
Assertion is true because the first law of thermodynamics states that ΔU = q + w. Reason is false because in an isolated system, ΔU = 0 as there is no transfer of energy as heat or work.
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