An ideal gas will have maximum density when

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(B) The density $(d)$ of an ideal gas is given by the formula $d = \frac{PM}{RT}$,where $P$ is pressure,$M$ is molar mass,$R$ is the gas constant,and

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$P = 2 \ atm, \ T = 150 \ K$

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(B) The density $(d)$ of an ideal gas is given by the formula $d = \frac{PM}{RT}$,where $P$ is pressure,$M$ is molar mass,$R$ is the gas constant,and $T$ is temperature.Since $M$ and $R$ are constant,$d \propto \frac{P}{T}$.Calculating the ratio $\frac{P}{T}$ for each option:$A$: $\frac{0.5}{600} \approx 0.00083$$B$: $\frac{2}{150} \approx 0.0133$$C$: $\frac{1}{300} \approx 0.0033$$D$: $\frac{1}{500} = 0.002$The ratio $\frac{P}{T}$ is maximum for option $B$.

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