Question

The limiting value of x/m is reached in the process of adsorption
(a) at low pressure,
(b) at high pressure
(c) at high temperature
(d) in vacuum​

Answer 1

question is incomplete

Explanation:

something is missing from the question

Answer 2

a) at low pressure

The adsorption equation can be given as Langmuir Expression that is

x/m = ap/(1+bp)

here x is mass of gas, m is mass of adsorbent, p is pressure, a and b are Langmuir's constants

at low pressure, 1+bp will almost have 1 value so the equation can ve written as

x/m = ap which will again have very low value as p is low

Therefore, the limiting value of x/m is reached in the process of adsorption at low pressure.