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Units of van der Waal's constants 'a' an...

Units of van der Waal's constants 'a' and 'b' are respectively

A

`L` atm `mol^(-1)` and `mol^(-2)` `L`

B

`L^(-1)` atm `mol^(-1)` and `mol ``L^(-1)`

C

`L^2`atm `mol^(-2)` and `mol^(-1)`` L`

D

`L^(-2)`atm `mol^2` and `mol^(-1)`` L`

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