Number of degrees of freedom of a gas A are higher compared to that of gas B at  the same temperature. It means

detailed solution

Correct option is A

In adiabatic process,  PVγ=constantBut  γ=1+2f.As f is high,  γ is low.Adiabatic Bulk modulus (which gives measure of elasticity of gas in adiabatic  process) =  BADIA=γP.If  γ is low, BADIA also low. It is easier to compress the gas A. Option (A) is correct.RMS velocity only depends on temperature and molar mass. Option (B) is wrong.fMIXTURE=f1n1+f2n2n1+n2. Option (C) is wrong.Dalton’s law is true for all gases. Option (D) is wrong.