An ideal gas will have maximum density when ___________. (A) P = 1 atm, T = 300 K (B) P = 2 atm, T = 150 K (C) P = 0.5 atm, T = 600 K (D) P = 1 atm, T = 500 K

From Ideal gas equation,

PV = nRT

On rearranging the above equation,

P = wRT/MV

w/V = PM/RT

ρ = PM/RT

From the above equation, we can say that on increasing the value of P and decreasing the value of T, density increases

Therefore, the answer is P = 2 atm, T = 150 K

So, the correct option is (B)

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