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The equation of state of a real gas is given by ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ + 2 V a P (V – b) = RT, where P, V and T are pressure, volume and temperature respectively and R is the universal gas constant. The dimensions of 2 b a is similar to that of :

1. P
2. RT
3. R
4. PV

Correct answer: P

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