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NEET levelSingle correct optionDifficulty 1 of 3rg089

The critical volume $V_{c}$ of a van der Waals gas is

A $b$
B $2 b$
C $3 b$
D $8 b /27$

Answer: C

Setting the first and second derivatives of

P

with respect to

V_{m}

to zero at the critical point gives

V_{c} = 3 b

,

T_{c} = 8 a /27 R b

and

P_{c} = a /27 b^{2}

.

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