The ratio a/b (the terms used in van der Waals' equation) has the unit .

Options

A. atm litre `mol^(-1)`
B. atm `dm^(3) mol^(-1)`
C. dyne `cm mol^(-1)`
D. All of these

Answer

D

Explanation

Unit of `a="atm litre"^(2)mol^(-2)`
`=atm dm^(6) mol^(-2)= "dyne" cm^(4) mol^(-2)`
Unit of `b="litre" mol^(-1)= dm^(3) mol ^(-1)= cm^(3)mol^(-1)`