NEET Chemistry (general) MCQ Question
Which combination of statements about thermodynamic processes is correct?
Under constant volume, the change in internal energy is equal to the heat supplied. 2. In isothermal expansion against constant external pressure, the work done is equal to the change in volume multiplied by the external pressure.
For isothermal processes, heat is always equal to the work done. 2. The internal energy change during an isothermal expansion is always zero.
Heat can be supplied without a change in internal energy during an adiabatic process. 2. The internal energy change is directly proportional to the work done during isothermal expansion.
During free expansion, no work is done and no heat is exchanged. 2. For constant pressure processes, the change in enthalpy equals the heat supplied.
Correct Answer
Detailed Explanation
Statement 1 in option A is correct as ΔU = qV at constant volume. Statement 2 is also correct since in isothermal expansion, work done is equal to p_ex(Vf - Vi).
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