In Langmuir’s model of adsorption of a gas on a solid surface:a.The mass of gas striking a given area of surface is independent of the pressure of the gas.b.The amount of gas striking a given area is proportional to the pressure of the gas.c.The adsorption at a single site may involve multiple molecules at the same time.d.The rate of desorption does not depend on the surface covered.

Adsorption is the adhesion[1] of atoms, ions or molecules from a gas, liquid or dissolved solid to a surface.[2] This process creates a film of the adsorbate on the surface of the adsorbent. This process differs from absorption, in which a fluid (the absorbate) is dissolved by or permeates a liquid or solid (the absorbent).[3] While adsorption does often precede absorption, which involves the transfer of the absorbate into the volume of the absorbent material, alternatively, adsorption is distinctly a surface phenomenon, wherein the adsorbate does not penetrate through the material surface and into the bulk of the adsorbent.[4] The term sorption encompasses both adsorption and absorption, and desorption is the reverse of sorption.

When the temperature is lowered and pressure is raised, the adsorption of a gas on a solida.Increasesb.Remains unaffectedc.Decreasesd.Decreases first then increases

Consider the following graph between the extent of adsorption (x/m) and pressure: What is the correct relation between T1, T2 and T3?a.T1>T2>T3b.T3<T2<T1c.T1<T2<T3d.None of the above

For an ideal gas*1 point(a) Size of molecules is negligible.(b) There is no force of attraction or repulsion amongst the molecules.(c) It strictly obeys the gas laws.(d) All of the above.

Freundlich adsorption isotherm is given by the expression x/m = KP1/n. Which of the following conclusions can be drawn from this expression?a.When n = 0, plot of x/m vs p is a curve.b.When 1/n = 0, the adsorption is independent of pressure.c.When 1n = 0, the adsorption is directly proportional to pressure.d.When n = 0, x/m vs p graph is a line parallel to x-axis.