Ncert Exercises & Solutions

Freundlich adsorption isotherm is given by the expression $\frac{x}{m} = k p^{\frac{1}{n}}$ Which of the following conclusions can be drawn from this expression?

(a) When

\frac{1}{n} = 0,

the adsorption is independent of pressure

(b) When

\frac{1}{n} = 0,

the adsorption is directly proportional to pressure

= 0,

$x\over m$vs p graph is a line parallel to x-axis

(d) When n = 0, plot of

\frac{x}{m}

vs p is a curve

The correct choice among the given is -
1. (a), (b)
2. (b), (c)
3. (c), (d)
4. (a), (c)

According to Freundlich adsorption isotherm

\frac{x}{m} \infty p^{\frac{1}{n}} \Rightarrow \frac{x}{m} = k p^{\frac{1}{n}}

(a) At

\frac{1}{n} = 0,

thiss equation becomes

\frac{x}{m} = k p ° = k

Extent of adsorption is independent of pressure.

\frac{x}{m} = k p^{\frac{1}{0}} = k p^{\infty}

Hence,

\frac{x}{m}

vs P graph can be plotted as

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