The Vander Waal's parameters for gases W, X, Y and Z are
Gasa (atm L2 mol−2)b (L mol−1)W4.00.027X6.00.030Y8.00.032Z12.00.027
Which one of these gases has the highest critical temperature ?
For Z gas of given gases, critical temprature is highest
Tc=8a27Rb⇒Tc=8×1227×0.0821×0.027=1603.98K