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  4. An ideal gas undergoes isothermal expansion at constant pressure. During the process:

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Q. An ideal gas undergoes isothermal expansion at constant pressure. During the process:

NTA AbhyasNTA Abhyas 2022

Solution:

$\text{ΔH} \, \text{=} \, \text{nC}_{\text{p}} \, \text{ΔT} \, \text{=} \, \text{0,} \, \therefore \, \text{ΔT} \, \text{=} \, \text{0}$
$\therefore $ Pext = defined
so process is irreversible.
$\text{ΔS} \, \text{=} \, \text{nRln } \left(\left(\text{V}\right)_{\text{f}} \left(\text{/V}\right)_{\text{i}}\right) \geq \text{0}$