For gas of identical particles, when we cool it down to extremely low temperature we can see one of two types of behaviour depending on the symmetry of wavefunction with respect to argument interchange, fermion and boson. This happens because particles become indistinguishable at quantum level and their wavefunction will be either symmetric or anti-symmetric.
But what if we consider a gas of non-identical particles? Let us say their masses are different. If we cool down this gas, because of different masses particles will still be distinguishable.
What will happen then, will the quantum effects (indistinguishability, wave-particle duality) appear then? Because of distinguishability of masses, could we use the Maxwell distribution at very low temperature too?