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Limitations of  Van der waal’s equation
(i) The value of ‘b’ is not constant but varies with pressure and temperature.
(ii) The value of  is not equal to 3b, but actually it is equal to, in some case; and in other cases 2b.
(iii)  The value of  is not equal to  but it is ususlly more than 3 for most of the gases.
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