Q9 / 160 · AP EAMCET 2021 (25 Aug Shift 2) · Chemistry

A real gas would be most likely to obey the ideal gas laws at

  • A
    low temperature and low pressure
  • Correct answer
    B
    high temperature and low pressure
  • C
    high temperature and high pressure
  • D
    low temperature and high pressure

Solution

Real gas shows ideal gas behaviour at high temperature and low pressure. e.g. Carbon monoxide (CO) would be most likely to obey the ideal gas law. Under high temperature and low pressure, the volume V is very large and terms in real gas i.e. ‘ $\frac{a}{V^2}$ and $b$ can be neglected. Hence, van der Waals' equation reduce to ideal gas equation, $p V=n R T$.

Hence, the correct answer is option: 'B'.

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