Question

According to Langmuir adsorption isotherm, the amount of gas adsorbed at a very high pressure:

• A. reaches a constant limiting value
• B. goes on increasing as the pressure increases
• C. goes on decreasing as the pressure decreases
• D. increases first and the decreases with an increase in pressure

Answer 1

The correct option is A reaches a constant limiting value

According to Langmuir adsorption isotherm, the amount of gas adsorbed at a very high pressure reaches a constant limiting value. This isotherm shows the characteristics of an exponential recovery graph where the rate is very high initially but it plateaus out as the pressure increases. Such an isotherm can be used to represent chemisorption which is monolayer in nature.