Chemical Thermodynamics Question 101

Question: During an isothermal expansion of an ideal gas its [CBSE PMT 1991]

Options:

A) Internal energy increases

B) Enthalpy decreases

C) Enthalpy remains unaffected

D) Enthalpy reduces to zero

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Answer:

Correct Answer: C

Solution:

During isothermal expansion of ideal gas, $ \Delta T=0 $

$ \Delta H=\Delta E+P\Delta V $

$ =\Delta E+nR\Delta T $

$ =0+0=0 $ .



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