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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3rg141

Gas P has $T_{B} = 110 K$ and gas Q has $T_{B} = 715 K$ . Both are examined at $300 K$ . Which statements are correct?

AP warms on Joule-Thomson expansion at $300 K$
BQ cools on Joule-Thomson expansion at $300 K$
CAt $300 K$ the $Z$ versus $P$ curve of Q shows a minimum while that of P does not
DThe critical temperature of Q is about $212 K$

Answer: A, B, C, D

T_{i} = 2 T_{B}

: for P

T_{i} = 220 K

, below

300 K

, so P warms (A true); for Q

T_{i} = 1430 K

, so Q cools (B true). Q is below its

T_{B}

(minimum present), P is above (no minimum) (C true).

T_{c} = 8 T_{B} /27 = 8 \times 715/27 = 211.9 K

(D true). P and Q resemble hydrogen and carbon dioxide.

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