JEE Advanced Model Paper 8 with solutions for online practice

The vanderwaal’s equation of state is
(P+

n2a

V2

) (V - nb) = nRT
For one mole and when b = 0, the above equation condenses to
(P+

a

V2

) V = RT ⇒ PV = RT -

a

V

..... (i)
Equation (i) is a straight line equation between PV and

1

V

whose slope is ' - a ' . Equating with slopeof the straight line given in the graph
- a =

20.1−21.6

3−2

= - 1.5 ⇒ a = 1.5