The Van der Waals constants '$a$' and '$b$' are related to which of the following respectively?

  • A
    Attractive forces and bond energy of molecules
  • B
    Volume and repulsive forces of molecules
  • C
    Shape and repulsive forces of molecules
  • D
    Attractive forces and volume of molecules

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Under which of the following conditions does a real gas behave most like an ideal gas?

Four gases $P, Q, R$ and $S$ have almost same values of $b$ but their $a$ values ($a, b$ are van der Waals' constants) are in the order $Q < R < S < P$. At a particular temperature among the four gases, the most liquefiable one is

Positive deviation from ideal behaviour is due to the fact that

$A$ gas described by van der Waal's equation:

At low pressures,van der Waals' equation is written as $(P + \frac{a}{V^2})V = RT$. The compressibility factor $Z$ will be

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