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A graph between \( x / m \) and the pressure \( P \) of the gas at a constant temperature is called adsorption isotherm. Where \( x \) is the no. of moles of the adsorbate and \( m \) is the mass of the adsorbent. Adsorption isotherms of different shapes have been experimentally observed. According to Frundlich adsorption isotherm.
\[
x / m=k P^{1 / n}
\]
where \( k \) and \( n \) are constant parameters depending upon the nature of the solid and gas.
Graph between \( \log \left(\frac{x}{m}\right) \) and \( \log P \) is a straight line at angle \( 45^{\circ} \) with intercept \( O A \) as shown.
Hence, \( \left(\frac{x}{m}\right) \) at a pressure of \( 2 \mathrm{~atm} \) is :
(a) 2
(b) 4
(c) 8
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