Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Which among the following statements are correct with respect to adsorption of gases on a solid? (1) The extent of adsorption is equal to\[k{{p}^{1/n}}\]according to Freundlich isotherm (2) Freundlich adsorption isotherm fails at low pressure (3) The extent of adsorption is equal to \[\left( \frac{ap}{1+bp} \right)\]according to Langmuir isotherm (4) The extent of adsorption is equal to \[\left( \frac{1+bp}{ap} \right)\]according to Langmuir isothermA) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: D
Solution :
Freundlich adsorption isotherm is\[\frac{x}{m}=k{{p}^{1/n}}\] At low pressure, \[\frac{x}{m}=kp\] Langmuir adsorption isotherm is \[\frac{x}{m}=\frac{ap}{1+bp}\]
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