####49. If $P, V, M, T$ and $R$ are pressure, Volume, molar mass, temperature and gas constant respectively, then for an ideal gas, the density is given by
[1989]
(a) $\frac{R T}{P M}$
(b) $\frac{P}{R T}$
(c) $\frac{M}{V}$
(d) $\frac{P M}{R T}$
(d) $P V=n R T=\frac{m}{M} R T$
or $P M=\frac{m}{V} R T=d R T \Rightarrow d=\frac{P M}{R T}$
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