States of Matter - Result Question 30
####30. A gas at $350 K$ and 15 bar has molar volume 20 percent smaller than that for an ideal gas under the same conditions. The correct option about the gas and its compressibility factor $(Z)$ is:
[2019]
(a) $Z>1$ and attractive forces are dominant
(b) $Z>1$ and repulsive forces are dominant (c) $Z<1$ and attractive forces are dominant
(d) $Z<1$ and repulsive forces are dominant
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Solution:
(c) Compressibility factor, $Z=\frac{PV}{nRT}$
Given: At $350 K$ and 15 bar, molar volume $<$ volume of ideal gas
$\therefore Z<1$
Therefore, attractive forces are dominant and the gas can be compressed easily.
