Hey Candidate,
The equation for the Ideal Gas behaviour is given by PV=NRT, where P represents pressure, V represent volume, N represents no. of moles, T represent temperature, and R stands for universal gas constant.
The equation for Real gas is a bit different than real gas and is given by- P+ (an*n/v*v). (V-nb)= RT. Hence, the term of an.n/v.v has also the same dimension as Pressure (dyne). The dimension of a = pressure. Volume*Volume, which denotes (Dyne cm.cm.cm.cm). So, the option "2" is correct.
Hope that the answer helps you!!
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