Chemistry - Ideal Gas Question with Solution | TestHub

According to graham's law of rate of diffusion, the rate of diffusion depends on pressure and molecular weight of the gas.
Rate of diffusion$\propto$partial pressure
$\propto \frac{1}{\sqrt{\mathrm{M}}}$
So According to graham's law of diffusion the rate of diffusion will be higher than the rate of diffusion of oxygen gas, So hydrogen gas will diffuse with a faster rate inside the balloon than oxygen gas will leave the balloon so balloon will enlarge in size.