Surface Chemistry Test

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Surface Chemistry Test - 2

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Weekly Quiz Competition

Question 1
1 / -0.25

Which among the following is a property of physisorption?

A
Non –specific in nature.

B
High enthalpy of adsorption.

C
Irreversibility.

D
All of the above.

Solution

In physisorption no chemical reaction, only physical interactions hence, not specific.
Question 2
1 / -0.25

Powdered substances are more effective adsorbents than their crystalline forms because:

A
Surface area increases.

B
Temperature increases.

C
Pressure increases.

D
All of the above.

Solution

Greater the surface area, greater will be the area available for adsorption.
Question 3
1 / -0.25

Which among the following is true for chemisorptions?

A
Occurs at low temperature.

B
Does not form surface complex.

C
Heat of adsorption is low.

D
Irreversible in nature.

Solution

As chemical reaction takes place in chemisorption, it cant be reversed.
Question 4
1 / -0.25

In physical adsorption increases when:

A
Temperature increases.

B
Temperature remains constant.

C
Temperature decreases.

D
None of these

Solution

adsorption is inversely proportional to the temperature . This is true for physical adsorption . In chemical adsorption due to the high energy of activation, the extent of adsorption increases initially and decreases as the temperature increases further.
Question 5
1 / -0.25

In physisorption, adsorption is generally

A
Multilayered

B
Monolayered

C
Bilayered

D
None of these

Solution

Physiorption includes physical forces of attraction, hence, multilayered is possible.
Question 6
1 / -0.25

The extent of adsorption increases with the ______.

A
Increase in temperature.

B
Decrease in the pressure of the gas.

C
Decrease in the surface area of the adsorbent.

D
Increase in the surface area of the adsorbent.

Solution

More the surface area, more is available space for adsorption.
Question 7
1 / -0.25

A biochemical catalyst is:

A
An enzyme

B
A carbohydrates

C
Nitrogen molecule

D
An amino acid

Solution

Enzymes are biological catalyst, they catalize different chemical reactions in body.
Question 8
1 / -0.25

The number of phases in colloidal system are:

A
Three

B
One

C
Two

D
Four
Solution
Colloidal system is a mixture of two substances, one of which, called the dispersed phase (or colloid), is uniformly distributed in a finely divided state through the second substance, called the dispersion medium (or dispersing medium).
So, here are 2 phases.
Question 9
1 / -0.25

Which among the following is not the method of colloidal purification?

A
Electrical disintegration

B
Dialysis

C
Ultrafilteration

D
Electro dialysis

Solution

Electrical Disintegration is not a method of colloidal purification.
Question 10
1 / -0.25

Chromatography is based on the principle of

A
Chemical adsorption

B
Hydrogen bonding

C
Absorption

D
Physical adsorption

Solution

Physical force of attraction between watt man filter paper (stationary phase) and adsorbent (mobile phase).

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Re-Attempt Weekly Quiz Competition

Surface Chemistry Test - 2

Result

Surface Chemistry Test - 2

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Question 1

Non –specific in nature.

High enthalpy of adsorption.

Irreversibility.

All of the above.

Solution

Question 2

Surface area increases.

Temperature increases.

Pressure increases.

All of the above.

Solution

Question 3

Occurs at low temperature.

Does not form surface complex.

Heat of adsorption is low.

Irreversible in nature.

Solution

Question 4

Temperature increases.

Temperature remains constant.

Temperature decreases.

None of these

Solution

Question 5

Multilayered

Monolayered

Bilayered

None of these

Solution

Question 6

Increase in temperature.

Decrease in the pressure of the gas.

Decrease in the surface area of the adsorbent.

Increase in the surface area of the adsorbent.

Solution

Question 7

An enzyme

A carbohydrates

Nitrogen molecule

An amino acid

Solution

Question 8

Three

One

Two

Four

Solution

Question 9

Electrical disintegration

Dialysis

Ultrafilteration

Electro dialysis

Solution

Question 10

Chemical adsorption

Hydrogen bonding

Absorption

Physical adsorption

Solution

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