Surface Chemistry Test

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Surface Chemistry Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

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

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
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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
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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
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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

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
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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

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

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

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).
Question 11
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Which among the following substances is an example of multimolecular colloids?

A
Starch sol

B
Sulphur sol

C
Micelles

D
Polystyrene

Solution

Multimolecular colloids are formed when a large number of atoms or molecules of a substance aggregate together to form speices having size in colloidal range. sulphur sol contains a thousand of S8 molecules.
Question 12
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Tyndall effect in colloidal solution is due to:

A
Reflection of light.

B
Scattering of light.

C
Presence of electrically charged particles.

D
Adsorption of light.

Solution

Tyndall effect is defined as scattering of light by colloidal particles.
Question 13
1 / -0

Adsorption isobar is a curve showing variation of adsorption ______.

A
With temperature at constant pressure.

B
With volume at constant temperature.

C
With volume at constant pressure.

D
With pressure at constant temperature.

Solution

Isobar means when pressure is constant.
Question 14
1 / -0

Which step of enzyme catalysis mechanism is shown in figure?

A
Binding of enzyme to substrate to form product.

B
Binding of enzyme to substrate to form an activated complex.

C
Decomposition of substrate to form product.

D
Decomposition of the activated complex to form products.

Solution

Substrate bind to specific site of enzyme known as active site to form a enzyme substrate complex.
Question 15
1 / -0

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

A
It is not specific in nature

B
It forms a monolayer

C
It occurs at low temperature

D
It has a reversible temperature

Solution

Langmuir isotherm assume monolayer formation only.
Question 16
1 / -0

When adsorption of oxalic acid is carried out on activated charcoal, then activated charcoal is known as

A
Adsorbate

B
Absorption

C
Adsorber

D
Adsorbent

Solution

Surface on which adsorption occurs is known as adsorbent.
Question 17
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Which of the following metal solution cannot be prepared by Bredig’s arc method?

A
Platinum

B
Gold

C
Potassium

D
Copper

Solution

Potassium due to very high reactivity, canot be used here.
Question 18
1 / -0

The average molecular mass of colloidal can be determined by

A
Osmotic pressure measurement

B
Flocculation value

C
Tyndall effect

D
None of these

Solution

Average molecular mass of colloidal solution is determined by Osmotic Pressure measurement.
Question 19
1 / -0

Which of the following processes does not involve a catalyst?

A
Oswald process

B
Haber process

C
Thermite process

D
Contact process

Solution

Thermite process doesn’t require a catalyst.
Question 20
1 / -0

Which type of a property is the Brownian movement of colloidal solution?

A
Mechanical

B
Electrochemical

C
Electrical

D
Optical

Solution

Movement is always a mechanical property.
Question 21
1 / -0

Ammonia is adsorbed by

A
Silica

B
Water

C
Charcoal

D
Alcohol

Solution

Charcoal act as an adsorbent.
Question 22
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Which among the following is adsorbed greatly by activated charcoal?

A
CH₄

B
SO₂

C
H₂

D
CO

Solution

SO₂due to high polarity and surface area is adsorbed maximum.
Question 23
1 / -0

Which among the following is an example of sorption?

A
Ammonia on charcoal

B
Ammonia on water

C
Water on calcium chloride

D
Chalk dipped in ink

Solution

When chalk is dipped in ink, absorption and adsorption both takes place which is called sorption.
Question 24
1 / -0

The adsorbent used in decolouration of vinegar and sugar solution is

A
Silica gel

B
Alumina gel

C
Oxygen

D
Activated carbon

Solution

It adsorbs the colour in solutions.
Question 25
1 / -0

The adsorbent used to adsorb the dye particles in the dying industry is

A
Activated charcoal

B
Silica gel

C
Alumina gel

D
Alum

Solution

Alum has pores on it which adsorbs the color of dye and makes the solution colorless.
Hence D is correct.

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Surface Chemistry Test - 13

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Surface Chemistry Test - 13

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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

Question 11

Starch sol

Sulphur sol

Micelles

Polystyrene

Solution

Question 12

Reflection of light.

Scattering of light.

Presence of electrically charged particles.

Adsorption of light.

Solution

CH₄

SO₂

H₂