The rate of diffusion of a gas is_______ proportional to both_______ and a square root of molecular mass

Diffusion is a process of gradual mixing of gases due to the motion of their particles even in the absence of mechanical agitation.

According to Graham’s law, the rate of diffusion or effusion of a gas is inversely proportional to the square root of its molecular mass.

Besides, the rate of diffusion depends on several factors like concentration gradient, surface area, time of diffusion, distance of the gas particles travel.

The rate of diffusion increases on the decrease of time i.e rate of diffusion is inversely proportional to the time taken.

Mathematically

r∝1tM where, r = rate of diffusion or effusion

M= Molecular mass of the gas

t = time

Hence, the correct option is B . i.e inversely, time