Question

Which among the following statements are correct with
respect to adsorption of gases on a solid?
(i) The extent of adsorption is equal to kpⁿ according to
Freundlich isotherm
(ii) The extent of adsorption is equal to to kp¹/ⁿ according
to Freundlich isotherm
(iii) The extent of adsorption is equal to (1+ bp)/ap
according to Langmuir isotherm
(iv) At low pressure x/m is directly proportional to the
pressure
(a) (i) and (iii) (b) (i) and (iv)
(c) (ii) and (iii) (d) (ii) and (iv)

Answer 1

i thought its option (c)

Answer 2

Statements which are correct with

respect to adsorption of gases on a solid are :

Let us check all statements one by one.

1. For first, it is given that " The extent of adsorption is equal to kpⁿ according to Freundlich isotherm "

• But according to Freundlich isotherm,

x/m = kp¹/ⁿ

• Hence, First statement is not true.

2. Let us see second statement, "The extent of adsorption is equal to to kp¹/ⁿ according to Freundlich isotherm ".

• It is true, as we saw relation between extent of adsorption and kp¹/ⁿ in above statement.

3. Langmuir isotherm is given as :

Theta = (1+ bp)/ap

• Therefore, statement c is correct.

• We have already two statements correct so we can jump onto choosing right answer.

• Correct option is (c)

(ii) and (iii)