The value of van der Waals constant `a` for the gases `O_(2)`, `N_(2)`, `NH_(3)`, and `CH_(4)` are `1.360`, `1.390`, `4.170`, and `2.253 L^(2) atm mol^(-2)`, respectively. The gas which can most easily be liquefied is

Options

A. `O_(2)`
B. `N_(2)`
C. `NH_(3)`
D. `CH_(4)`

Answer

C

Explanation

`(p+(an^(2))/V^(2))(V-nb)=nRT`
In this equation, a is used in pressure correction and its value depends upon the intermolecular force between the gaseous molecules. So, larger the value of a for a gas, more easily that gas can be liquefied.