JEE Main · 2020 · 05 Sep 2020 · Shift 2 · Surface Chemistry

Adsorption of a gas follows Freundlich adsorption isotherm. If

x

is the mass of the gas adsorbed on mass

m

of the adsorbent, the correct plot of

\frac{x}{m}

versus

p

is:

(A)(see graph)
(B)(see graph)
(C)(see graph)
(D)(see graph)
✓ Correct

Answer: (D)

Solution

The Freundlich isotherm

\frac{x}{m} = K p^{1/ n}

with

n > 1

makes the amount adsorbed rise with pressure but ever more slowly, the curve bending over and levelling off at high pressure rather than climbing without limit or holding a straight line. The plot showing this rising-then-flattening curve is the correct one.

JEE Main · 2020 · 05 Sep 2020 · Shift 2 · Single correct option

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