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The units of ‘a’ in van der Waals equation of state is

a) atm. litre \[ mol^{-1}\]
b) atm. litre\[^{2}mol^{-2}\]
c) atm. litre\[^{2}mol^{2}\]
d) atm. litre \[mol^{-2}\]

Answer: b
Explanation: atm. litre\[^{2}mol^{-2}\]

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