MCQs of Surface Chemistry

Surface Chemistry MCQs

MCQs of Surface Chemistry

Showing 101 to 110 out of 203 Questions

101.

The unit of gas adsorption on solid adsorbent is expressed as _____ .

(a)	ml / mole
(b)	mole / ml
(c)	g / mole
(d)	mole / g

102.

What is the value of intercept in the graph of

\frac{m}{x} \to \frac{1}{p}

in Freundlich adsorption isotherm ?

(a)	$\frac{b}{m}$
(b)	$\frac{a}{m}$
(c)	$\frac{b}{a}$
(d)	$\frac{a}{b}$

103.

If H₂, He, CH₄, CO₂ and NH₃ gases are gradually brought in contact with 10 g. Charcoal at 240 K, what will be the correct order of their extent of adsorption on charcoal ?

(a)	He > H₂ > CH₄ > CO₂ > NH₃
(b)	CO₂ > NH₃ > H₂ > He > CH₄
(c)	NH₃ > CO₂ > CH₄ > H₂ > He
(d)	CH₄ > CO₂ > NH₃ > H₂ > He

104.

Which of the following is not suitable for chemisorptions ?

(a)	There is no noticeable effect of change in temperature.
(b)	It is multimolecular.
(c)	Depends upon nature of gas.
(d)	It is irreversible.

105.

Which equation of Langmuir adsorption isotherm will apply at high pressure ?

(a)	$\frac{x}{m} = \frac{b}{a}$
(b)	$\frac{x}{m} = a \cdot p$
(c)	$\frac{x}{m} = \frac{1}{a \cdot p}$
(d)	$\frac{x}{m} = \frac{a}{b}$

106.

What is the Langmuir adsorption isotherm formula at very low pressure ?

(a)	$\frac{x}{m} = a p$
(b)	$\frac{x}{m} = \frac{a}{b}$
(c)	$\frac{x}{m} = K p^{\frac{1}{n}}$
(d)	$\frac{x}{m} = \frac{a p}{1 + b p}$

107.

What is the phenomenon when (yellow) colour of sugar solution is removed by charcoal ?

(a)	Adsorption
(b)	Absorption
(c)	Adsorption and absorption both (i.e. sorption)
(d)	None of the above

108.

Which of the following is not a surface phenomenon ?

(a)	Water and its vapour in a closed vessel
(b)	Heterogeneous catalysis
(c)	Crystallization
(d)	Corrosion

109.

For the phenomenon of adsorption of gas on solid surface, Langmuir adsorption isotherm indicates that _____.

(a)	many molecules of gas combine with every single molecule of exterior monomolecular layer on solid surface.
(b)	the rate at which molecules of gas colloid at specific sites on solid surface is proportional to pressure of the gas.
(c)	the rate of colloding molecules of gas on solid surface is independent of pressure of the gas.
(d)	the rate of desorption of gas molecules form surface of solid does not depend on the surface of the solid.

110.

Which of the following statements is wrong for physical adsorption ?

(a)	It arises due to van der Waals’ forces.
(b)	The gases which can be easily liquefied are adsorbed immediately (rapidly).
(c)	Multimolecular layers are formed on the surface of the adsorbent under high pressure.
(d)	The value of adsorption enthalpy ΔH_adsorption is low and positive.

Showing 101 to 110 out of 203 Questions