The variation in the amount of gas adsorbed by the adsorbent with pressure at constant temperature can be expressed by means of a curve termed as adsorption

Options

A. isobar
B. isotherm
C. isochore
D. isostere

Answer

B

Explanation

It is called adsorption isotherm. Adsorption isobar shows the effect of temperature on the extent of adsorption at a given pressure. The curve showing the variation of pressure with temperature, for a given amount of adsorption, is called an isoter.

Since rise of temperature tends to lower the extent of adsorption, in order to get the same amount of adsorption at a higher temperature, we need to raise the pressure of the system as well. Hence, a straigh line relationship between temperature and pressure is generally obtained.