AIIMS 2019 Chemistry First Law of Thermodynamics MCQ Question
Assertion : In a process, if then .
Reason : is the difference between the initial state and final state of a system.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
In the context of the 1st law of thermodynamics, the equation ΔU = q + w indicates that the change in internal energy (ΔU) is dependent on heat (q) and work (w). When work (w) is zero, ΔU equals q, which is not a state function because it depends on the specific path taken during the reaction, such as whether the process is isothermal or adiabatic. This contrasts with ΔU, which is a state function and depends only on the initial and final states of the system, regardless of the path. Other options are not relevant as they do not provide any alternative explanations or correct statements regarding the nature of state functions and path-dependent properties.
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