Adsorption of gas on a surface follows Freundlich adsorption isotherm. The plot of log ⁡ x m versus log P gives a straight line with slope equal to 0 . 5 , then: ( x m is the mass of the gas adsorbed per gram of adsorbent)

adsorption is proportional to the square root of pressure.

adsorption is proportional to the square of pressure.

adsorption is proportional to the pressure.

adsorption is independent of pressure.

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The type of absorption is highly specific and takes place at high temperature with unimolecular layer is

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Important Questions on Surface Chemistry

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Chemistry>Physical Chemistry>Surface Chemistry>Adsorption

Give two differences between physical adsorption and chemical adsorption.

MEDIUM

Chemistry>Physical Chemistry>Surface Chemistry>Adsorption

Write the difference between physical adsorption and chemical adsorption. (Any six points).

MEDIUM

Chemistry>Physical Chemistry>Surface Chemistry>Adsorption

The variation of physical adsorption with temperature is shown by

EASY

Chemistry>Physical Chemistry>Surface Chemistry>Adsorption

Given below are the critical temperatures of some of the gases:

Gas	Critical temperature $(K)$
$He$	$5.2$
${CH}_{4}$	$190$
${CO}_{2}$	$304.2$
${NH}_{3}$	$405.5$

The gas showing least adsorption on a definite amount of charcoal is

EASY

Chemistry>Physical Chemistry>Surface Chemistry>Adsorption

Which one of the following is not a property of physical adsorption?

MEDIUM

Chemistry>Physical Chemistry>Surface Chemistry>Adsorption

Which of the following statements regarding the adsorption of gases on solid surface is FALSE?

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Chemistry>Physical Chemistry>Surface Chemistry>Adsorption

Why does physisorption decrease with rise of temperature ?

EASY

Chemistry>Physical Chemistry>Surface Chemistry>Adsorption

Adsorption of gas on a surface follows Freundlich adsorption isotherm. The plot of

\log \frac{x}{m}

versus

\log (P)

gives a straight line with slope equal to

0.5

, then:

(

\frac{x}{m}

is the mass of the gas adsorbed per gram of adsorbent)

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Chemistry>Physical Chemistry>Surface Chemistry>Adsorption

Which of the following Absorption-Temperature graphs represent the variation of physical adsorption with temperature?

EASY

Chemistry>Physical Chemistry>Surface Chemistry>Adsorption

Which of the following is not true for physical adsorption?

EASY

Chemistry>Physical Chemistry>Surface Chemistry>Adsorption

Which one of the following is not true with regard to physisorption?

HARD

Chemistry>Physical Chemistry>Surface Chemistry>Adsorption

What are different types of adsorption? Give any four differences between characteristics of these different types.

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Chemistry>Physical Chemistry>Surface Chemistry>Adsorption

Match List I with List II

List I		List II
A	Physisorption	I	Single Layer Adsorption
B	Chemisorption	II	$20 - 40 kJ {mol}^{- 1}$
C	$N_{2} (g) + 3 H_{2} (g) \overset{Fe (s)}{⟶} 2 {NH}_{3} (g)$	III	Chromatography
D	Analytical Application or Adsorption	IV	Heterogeneous catalysis

Choose the correct answer from the options given below:

HARD

Chemistry>Physical Chemistry>Surface Chemistry>Adsorption

Physisorption of ą gas is spontaneous at

77 K

. The effect of increase in temperature on physisorption is

MEDIUM

Chemistry>Physical Chemistry>Surface Chemistry>Adsorption

3 g

of activated charcoal was added to

50 mL

of acetic acid solution

(0.06 N)

in a flask. After an hour, it was filtered and the strength of the filtrate was found to be

0.042 N

. The amount of acetic acid adsorbed (per gram of charcoal) is:

MEDIUM

Chemistry>Physical Chemistry>Surface Chemistry>Adsorption

For a linear plot of

\log (\frac{x}{m})

versus

\log p

in a Freundlich adsorption isotherm, which of the following statements is correct? (

k

and

n

are constants)

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Chemistry>Physical Chemistry>Surface Chemistry>Adsorption

What is an adsorption isotherm? Describe Freundlich adsorption isotherm.

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Chemistry>Physical Chemistry>Surface Chemistry>Adsorption

Why does physisorption decrease with increase of temperature?

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Chemistry>Physical Chemistry>Surface Chemistry>Adsorption

The extent of physical adsorption of a gas increases with

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Chemistry>Physical Chemistry>Surface Chemistry>Adsorption

The following graph is obtained for physisorption of a gas as a function of pressure at different temperatures.
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The correct order of the temperatures is:

The type of absorption is highly specific and takes place at high temperature with unimolecular layer is

Important Questions on Surface Chemistry

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