Freundlich adsorption isotherm is given by the expression x/m= kp^1/x which of the following conclusion can be drawn from this expression.

(i) When 1/n= 0, the adsorption is independent of pressure.

(ii) When 1/n= 0, the adsorption is directly proportional to pressure.

(iii) When n= 0, x/m vs p graph is a line parallel to x-axis.

(iv) When n= 0, plot of x/m vs p is a curve.

<p>This is a Multiple Choice Type Questions as classified in NCERT Exemplar</p><p><strong>Ans:</strong> (i) and (iii)</p><p>Freundlich gave an empirical relationship between the quantity of gas adsorbed by unit mass of solid adsorbed and pressure at a particular temperature.</p><p><span contenteditable="false"> <math> <mfrac> <mrow> <mrow> <mi mathvariant="normal">x</mi> </mrow> </mrow> <mrow> <mrow> <mi mathvariant="normal">p</mi> </mrow> </mrow> </mfrac> </math> </span>=kp<span contenteditable="false"> <math> <mfrac bevelled="true"> <mrow> <mrow> <mn>1</mn> </mrow> </mrow> <mrow> <mrow> <mi mathvariant="normal">n</mi> </mrow> </mrow> </mfrac> </math> </span></p><p>If <span contenteditable="false"> <math> <mfrac> <mrow> <mrow> <mn>1</mn> </mrow> </mrow> <mrow> <mrow> <mi mathvariant="normal">n</mi> </mrow> </mrow> </mfrac> </math> </span>&nbsp;= 0 ; <span contenteditable="false"> <math> <mfrac> <mrow> <mrow> <mi mathvariant="normal">x</mi> </mrow> </mrow> <mrow> <mrow> <mi mathvariant="normal">m</mi> </mrow> </mrow> </mfrac> </math> </span>&nbsp;= k xtent of adsorption is independent of pressure</p><p>When n=0 ; <span contenteditable="false"> <math> <mfrac> <mrow> <mrow> <mi mathvariant="normal">x</mi> </mrow> </mrow> <mrow> <mrow> <mi mathvariant="normal">m</mi> </mrow> </mrow> </mfrac> </math> </span>&nbsp;= kp</p><p><span contenteditable="false"> <math> <mfrac> <mrow> <mrow> <mi mathvariant="normal">x</mi> </mrow> </mrow> <mrow> <mrow> <mi mathvariant="normal">m</mi> </mrow> </mrow> </mfrac> </math> </span>&nbsp;vs p is a line</p><p>parallel to x-axis</p>

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