The vander waal gas constant `'a'` is given by

The van der Waal's gas constant, a is given by

For four gases vander waal's constant a & b are given as following Between gas A & C which has higher volume and between gas B & D which has higher compressibility?

If the Vander Waal's constant of gas A are given as - a ( atm L^(2) mol^(2) ) =6.5 b( L mol^(1) ) 0.056 than critical pressure of A is

The value of Vander Waal's constant a' is maximum for

The ratio of units of vander Waals constants a and b is

If the value of Vander Waal's constant 'a' for a gas is zero, can it be liquefied ?