JEE Mains · Chemistry · STD 11 - 5. Thermodynamics and thermochemistry
An ideal gas undergoes isothermal expansion at constant pressure. During the process
- A enthalpy increases but entropy decreases
- B enthalpy remains constant but entropy increases
- C enthalpy decreases but entropy increases.
- D Both enthalpy and entropy remain constant.
Answer & Solution
Correct Answer
(B) enthalpy remains constant but entropy increases
Step-by-step Solution
Detailed explanation
\(\Delta H = n{c_p}\Delta T = 0\) means \(\Delta H\) constant. \(\Delta S = nR\,\ln {\kern 1pt} \left( {\frac{{{v_f}}}{{{v_i}}}} \right) \geqslant 0\) \(\Delta S\) increases.
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