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In the following compressibility factor $(\mathrm{Z})$ vs pressure graph at $300 \mathrm{~K}$, the compressibility of $\mathrm{CH}_{4}$ at pressure $ < 200$ bar deviates from ideal behaviour because
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The molar volume of $\mathrm{CH}_{4}$ is less than its molar volume in the ideal state
$Z=\frac{\left(\mathrm{V}_{\mathrm{M}}\right) \mathrm{r}}{\left(\mathrm{V}_{\mathrm{M}}\right)_{\mathrm{i}}} < 1$ at $\mathrm{p} < 200 \mathrm{bar}$
$\therefore\left(\mathrm{V}_{\mathrm{M}}\right)_{\mathrm{r}} < \left(\mathrm{V}_{\mathrm{M}}\right)_{\mathrm{i}}$
$\therefore\left(\mathrm{V}_{\mathrm{M}}\right)_{\mathrm{r}} < \left(\mathrm{V}_{\mathrm{M}}\right)_{\mathrm{i}}$
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