The temperature at which a real gas obeys ideal gas laws over an appreciable range of pressure is called ..........

Assertion : Greater the value of van der Waal's constant $a$,greater is the liquefaction of gas.
Reason : $a$ indirectly measures the magnitude of attractive forces between the molecules.

$A$ gas that follows Boyle's law,Charle's law and Avogadro's law is called an ideal gas. Under what conditions does a real gas behave ideally?

Explain the compressibility factor $(Z)$.

The $P$ vs $V$ graph is plotted for $1$ $mole$ of a hypothetical gas. Based on the given isotherms at $200 \ K$ and $300 \ K$,determine the range of $\frac{a}{b}$ for this gas in $atm-L \ mole^{-1}$. [Given: $R = 0.08 \ atm-L \ mole^{-1} \ K^{-1}$]

The van der Waals equation is valid for $......$.