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NEET 2020

Exam: NEET
Year: 2020
Subject: Chemistry
Chapter: Thermodynamics (C)

NEET 2020 · Chemistry · Thermodynamics (C)

The correct option for free expansion of an ideal gas under...

The correct option for free expansion of an ideal gas under adiabatic condition is

Options

A $q = 0, \Delta T < 0$ and $w > 0$
B $q < 0, \Delta T = 0$ and $w = 0$
C $q > 0, \Delta T > 0$ and $w > 0$
D $q = 0, \Delta T = 0$ and $w = 0$

Correct answer

D. $q = 0, \Delta T = 0$ and $w = 0$

Step-by-step solution

Free expansion of ideal gas

${P}_{ext} = 0$

${w}_{pv} = 0$

$q = 0$ (adiabatic process)

$\Delta E = q + w$

$\Delta E = 0$

$\Delta E = {nC}_{V}\Delta T = 0$

$q = 0, \Delta T = 0, w = 0$

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