Surface Chemistry

On the basis of Langmuir adsorption isotherm the amount of gas adsorbed at very high pressure.

• Reaches a constant limiting value

• Goes on increasing with pressure

• Goes on decreasing with pressure

• First increasing and then decreasing with pressure

If x is amount of adsorbate and m is amount of adsorbent, which of the following relations is not related to adsorption process?

• $\frac{x}{m} = \mathrm{f}\left(T\right) \mathrm{at} \mathrm{constant} p$

• $p = \mathrm{f}\left(\mathrm{T}\right) \mathrm{at} \mathrm{constant} \left(\frac{x}{m}\right)$

• $\frac{x}{m} = p \times \mathrm{T}$

• $\frac{x}{m} = \mathrm{f}\left(\mathrm{p}\right) \mathrm{at} \mathrm{constant} \mathrm{T}$

Which of the following represents physical adsorption?

Which of the following curves is in accordance with Freundlich adsorption isotherm?

In the presence of a catalyst, the heat evolved or absorbed during the reaction

• increases

• decreases

• remains unchanged

• may increase or decrease

Cow milk, an example of natural emulsion, is stabilised by

• fat

• water

• casein

• Mg²⁺ ions

Gold number is associated with

• amount of gold

• protective colloids

• purple of cassius

• electrophoresis

Which one of the following forms micelles in aqueous solution above certain concentration?

• Urea

• Dodecyl trimethyl ammonium chloride

• Pyridinium chloride

• Glucose

Migration of colloidal particles towards the oppositely charged electrode is called:

• Electrosmosis

• Electrophoresis

• Coagulation

• Electrodispersion

The variation of adsorption of N, on charcoal with pressure at different constant temperature can be represented by :

The correct increasing order of temperature
T₁ , T₂ and T₃ is :

• T₁ < T₂ < T₃

• T₂ < T₃ < T₁

• T₃ < T₂ < T₁

• T₂ < T₁ < T₃