Surface Chemistry Test

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Surface Chemistry Test - 54

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Weekly Quiz Competition

Question 1
1 / -0

Physisorption is :

A
It is highly specific in nature

B
It is reverisible

C
It is caused by chemical bond formation

D
All of the above

Solution

Physisorption is a reversible process. It is not specific in nature and is not caused by chemical bond formation.
Question 2
1 / -0

Which of the following statements is not correct?

A
Physical adsorption is monolayer

B
Physical adsorption is reversible in nature

C
Physical adsorption is involves low activation energy

D
The extent of physical adsorption decreases with increases in temperature

Solution

Physical adsorption is multilayer adsorption.
Question 3
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For physisorption, heat of adsorption is genrally in the range:

A
$$20-40 KJ $$

B
$$ 40-60 KJ $$

C
$$100-150KJ $$

D
$$300-400KJ$$

Solution

For physisorption, heat of absorption is low around $$20-40kJ$$.
Question 4
1 / -0

Physical adsorption take place at low temprature and:

A
increase with increase in temprature

B
decrease with increase in temprature

C
decrease with decrease in temprature

D
None of these

Solution

Physical adsorption changes to chemical adsorption with increase in temperature.
Question 5
1 / -0

What can be observed when sunlight is passed through a colloidal solution?

A
Adsorption

B
Coagulation

C
Tyndall effect

D
Brownian motion

Solution

The Tyndall effect is the scattering of light as a light beam passes through a colloid. The individual suspension particles scatter and reflect light, making the beam visible. The amount of scattering depends on the frequency of the light and density of the particles. The angle through which sunlight in the atmosphere is scattered by molecules of the constituent gases varies inversely as the fourth power of the wavelength; blue light will be scattered much more strongly than will the long wavelength red light. The visible beam of headlights in fog is caused by the Tyndall effect. The water droplets scatter the light making the headlight beams visible.
Question 6
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Which of the following substances can be compressed?

A
Sponge

B
Stone

C
Magnet

D
Diamond

Solution

A sponge has minute holes,in which air is trapped, when we press it,the air is expelled out and we are able to compress it.sponge is a porous solid.but in other words the property of compressibility means an object is compressed and it remains in that compressed shape until we apply force to get it back to its normal position and when we compress sponge it comes back to its original shape automatically in a minute or two.
Question 7
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Which of the following statements is incorrect with respect to physisorption?

A
The forces involved are van der Waal's forces

B
More easily liquifiable gases are adsorbed easily

C
Under high pressure it results into multi-molecular layer on adsorbent surface

D
$$\Delta H_{adsorption}$$ is low and $$+$$ve

Solution

Adsorption is always exothermic therefore $$\Delta H$$ is always negative.

Physical adsorption is an exothermic process $$(i.e., ΔH = –ve)$$ but its value is quite low because the attraction of gas molecules and solid surface is weak van der Waals forces.

Hence, option D is an incorrect statement.
Question 8
1 / -0

Oil floats on water. The most accurate reason for this is:

A
oil is less dense than water

B
oil is immiscible (does not dissolve) in water

C
oil is both less dense and immiscible with water

D
water is heavier than oil

Solution

Oil always floats to the top of water because it is less dense than water. Oil and water don't mix.
Question 9
1 / -0

What is the use of colloidal copper ?

A
In treatment of cancer

B
In treatment of syphilis

C
Diagnostic agent for paresis

D
None of these

Solution

Colloidal metal supplements are used to treat deficiencies of metals in the body and boost its immune system. Colloidal copper is actually small flecks of copper mixed with purified water. The water acts as a vehicle for delivering the metal to the digestive system.
Copper acts as an excellent anti-oxidant which helps prevents and treats diseases like.- diabetes and some cases claims, also prevents cancer., Proper Growth and Health, Copper is vital for good health and normal growth. It helps in the protection of skeletal, nervous and cardiovascular systems.
Question 10
1 / -0

Which of the following statements is incorrect regarding physisorption?

A
It occurs because of van der Waals forces.

B
More easily liquefiable gases are adsorbed readily.

C
Enthalpy of adsorption (adsorption) is low and positive.

D
Under high pressure it results into multimolecular layer on adsorbent surface.

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Surface Chemistry Test - 54

Result

Surface Chemistry Test - 54

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SHARING IS CARING

Question 1

It is highly specific in nature

It is reverisible

It is caused by chemical bond formation

All of the above

Solution

Question 2

Physical adsorption is monolayer

Physical adsorption is reversible in nature

Physical adsorption is involves low activation energy

The extent of physical adsorption decreases with increases in temperature

Solution

Question 3

$$20-40 KJ $$

$$ 40-60 KJ $$

$$100-150KJ $$

$$300-400KJ$$

Solution

Question 4

increase with increase in temprature

decrease with increase in temprature

decrease with decrease in temprature

None of these

Solution

Question 5

Adsorption

Coagulation

Tyndall effect

Brownian motion

Solution

Question 6

Sponge

Stone

Magnet

Diamond

Solution

Question 7

The forces involved are van der Waal's forces

More easily liquifiable gases are adsorbed easily

Under high pressure it results into multi-molecular layer on adsorbent surface

$$\Delta H_{adsorption}$$ is low and $$+$$ve

Solution

Question 8

oil is less dense than water

oil is immiscible (does not dissolve) in water

oil is both less dense and immiscible with water

water is heavier than oil

Solution

Question 9

In treatment of cancer

In treatment of syphilis

Diagnostic agent for paresis

None of these

Solution

Question 10

It occurs because of van der Waals forces.

More easily liquefiable gases are adsorbed readily.

Enthalpy of adsorption (adsorption) is low and positive.

Under high pressure it results into multimolecular layer on adsorbent surface.

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