The adsorption isotherm for a gas is given by the relation $x = \frac{ap}{1 + bp}$,where $x$ is moles of gas adsorbed per gram of the adsorbent,$p$ is the pressure of the gas,and $a$ and $b$ are constants. Then $x$:
- Aincreases with $p$
- Bremains unchanged with $p$
- Cdecreases with $p$
- Dincreases with $p$ at low pressures and then remains the same at high pressures
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