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The correction factor 'a' to the ideal gas equation corresponds to
Explanation
'a' corrects pressure for intermolecular attraction; 'b' corrects volume.
Detailed Solution
In the real gas equation, $\left(P + \frac{an^2}{V^2}\right)(V - nb) = nRT$
van der Waals constant 'a' signifies intermolecular forces of attraction.