van der Waals' constants for neon and hydrogen are ( $a_{1}, b_{1}$ ) and ( $a_{2}, b_{2}$ ) respectively. The maximum number of moles of neon which will form a homogeneous mixture with n2 moles of hydrogen at 25° C and constant pressure P is :

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$27 n_{2} \frac{P b_{1}^{2}}{a_{1}}$

$27 n_{2} \frac{P b_{2}^{2}}{a_{2}}$

$\infty$

$4 n_{2} \frac{P b_{2}^{2}}{a_{2}}$

answer is D.

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Detailed Solution

Gaseous mixtures are always homogeneous. So, maximum infinite number of moles can be added.Van der Waal's constants for neon and helium are as follows: neon: $a_{1}, b_{1},$ and helium: $a_{2}, b_{2} .$
because the gases can be blended together uniformly. These shouldn't be any specific ratio in order to allow for the mixing of indefinite moles.