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States of Matter — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryStates of Matter3 Marks
Question
Define:
  1. Critical pressure.
  2. Critical volume and give their expressions.
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Answer

  1. Critical pressure: It is pressure required to liquefy the gas at critical temperature.
$\text{P}_\text{c}=\frac{\text{a}}{27\text{b}^2}$

Where 'a' and 'b' are van der Waal's constant.
  1. Critical volume: It is the volume occupied by 1 mole of a gas at critical temperature and pressure.
$\text{V}_\text{c}=3\text{b}$

Where ' $b$ ' is volume occupied by gas molecule in $\mathrm{L} \mathrm{~mol}^{-1}$.

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