Surface Chemistry Test

Result

Surface Chemistry Test - 12

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Weekly Quiz Competition

Question 1
1 / -0

What kind of forces exists between adsorbate and adsorbent in physisorption?

A
Hydrogen Bond

B
Ionic Bond

C
Covalent Bond

D
London Force

Solution

Physisorption is defined as adsorption in which force between adsorbate and adsorbent is physical van der Waals force also known as London force.
Question 2
1 / -0

Adsorbate is represented by which spheres in the following diagram.

A
White

B
Black

C
both

D
none

Solution

The adsorbent is that substance that gathers/adsorb molecules on its surface, and adsorbate is that substance that gets gather/adsorb by itself on the surface of the absorbent.
Hence, Black molecules should be adsorbate.
Question 3
1 / -0

Which phenomenon is represented by the following diagram?

A
Adsorption

B
Absorption

C
Desorption

D
Sorption

Solution

Adsorption is a surface phenomenon where concentration of the molecules, is more on the surface than in the core.
Question 4
1 / -0

Which of the following statement is correct about Langmuir’s adsorption?

A
It is not specific in nature.

B
It occurs at low temperature.

C
It is reversible in nature.

D
It forms monolayer.

Solution

At the maximum adsorption, only a monolayer is formed: molecules of adsorbate do not deposit on other, already adsorbed, molecules of adsorbate, only on the free surface of the adsorbent.
Question 5
1 / -0

Why shoes, purses and leather items have silica gel pouches kept in them?

A
For good fragrance.

B
For insect repellant

C
For adsorption of moisture.

D
For all the above.

Solution

Solids, particularly in a finely divided state, have a large surface area and so silica gel is a good adsorbent and keeps the leather dry and free of moisture.
Question 6
1 / -0

The relation between extent of adsorption (x/m) and pressure at constant temperature is called as:

A
Isochore

B
Isomer

C
Isobar

D
Isotherm

Solution

Freundlich adsorption isotherm gives an empirical relationship between the quantity of gas adsorbed by the unit mass of solid adsorbent (x/m) and pressure at a specific temperature.
Question 7
1 / -0

Which of the following is the reason for adsorption?

A
Internal core molecules are experiencing more inward force.

B
Surface molecules are experiencing more inward force.

C
Internal core molecules are experiencing less inward force.

D
Surface molecules are experiencing less inward force.

Solution

There is an unbalanced attractive force of adsorbent are responsible for attracting the adsorbate particles on its surface.