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JEE Main levelSingle correct optionDifficulty 2 of 3rg150

Match the critical constant with its van der Waals expression. (P) $V_{c}$ , (Q) $P_{c}$ , (R) $T_{c}$ . (1) $a /27 b^{2}$ ; (2) $3 b$ ; (3) $8 a /27 R b$ . The correct matching is

AP-2, Q-1, R-3
BP-1, Q-2, R-3
CP-3, Q-1, R-2
DP-2, Q-3, R-1

Answer: A

The standard results are

V_{c} = 3 b

,

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

and

T_{c} = 8 a /27 R b

, giving P-2, Q-1, R-3.

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