A gas in container A is in thermal equilibrium with another gas in container B. Both contain equal masses of the two gases. Which of the following can be true?

According to the problem, mass of gases is equal so number of moles will not be equal, i.e., μA≠μBFrom ideal gas equation, PV=μRT∴PAVAμA=PBVBμB(as temperatures of the containers are equal) From this relation it is clear that if PA=PB; then          VAVB=μAμB≠1i.e.,   VA≠VBSimilarly, if VA=VB then             PAPB=μAμB≠1 i.e.,  PA≠PB