Which of the following is not correct?
(a) Diffusion of gases occurs more rapidly at higher temperatures.
(b) Effusion of H₂ is faster than effusion of He (assume similar conditions and a rate expressed in units of mol/h).
(c) Diffusion will occur faster at low pressure than at high pressure.
(d) The rate of effusion of a gas (mol/h) is directly proportional to molar mass.