NEET Chemistry First Law MCQ Question
Consider a diagram depicting a thermodynamic system where a change of state occurs through both work done on the system and heat transfer. Which statement correctly describes the relationship between the change in internal energy (∆U), heat transfer (q), and work done (w) for this system?
The change in internal energy is the sum of heat transfer and work done.
The change in internal energy depends solely on the heat transfer.
The change in internal energy is equal to work done minus heat transfer.
The change in internal energy is unaffected by work done or heat transfer.
Correct Answer
Detailed Explanation
According to the first law of thermodynamics, the change in internal energy (∆U) of a system is given by the equation ∆U = q + w, which implies it is the sum of the heat transfer to the system and the work done on the system.
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