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# In Van der waal's equation of state of the gas law the constant 'b' is a measure of :

$\begin {array} {1 1} (a)\;Intermolecular \;collisions\; per\; unit\; volume\\(b)\;Intermolecular\; attractions\;\\(c)\;Volume\; occupied\; by\; the\; molecules\\(d)\;Intermolecular\; repulsions \end {array}$

b = $4N\times V$
i.e total volume occupied by molecules one mole of gas in motion