Surface Chemistry Test

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Surface Chemistry Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements about chemisorption is not true?

A
Adsorbate molecules are bound to the surface of adsorbent by chemical bonds.

B
Chemisorption is an endothermic process.

C
This process increases with increase in surface area of the adsorbent.

D
This process is highly specific in nature.

Solution

Chemisorption is an exothermic process.
Question 2
1 / -0

A plot of log x/m versus log p for the adsorption of a gas on a solid gives a straight line with slope equal to

A
log k

B
n

C
1/n

D
log n

Solution

Straight line equation is formed in this case.

log x/m = log x + 1/n log P

So, Y = C + mx

So, the slope is equal to 1/n
Question 3
1 / -0

During Freundlich adsorption process, the value of 1/n is

A
1 in case of chemical adsorption

B
1 in case of physisorption

C
always greater than 10

D
between 0 and 1 in all cases

Solution

The value of 1/n always lies between 0 and 1 in all cases.
Question 4
1 / -0

Methylene blue is adsorbed from its aqueous solution on activated charcoal at 25^oC. For this process, which of the following statements is correct?

A
The adsorption requires activation at 25^oC.

B
The adsorption is accompanied by a decrease in enthalpy.

C
The adsorption increases with increase in temperature.

D
The adsorption is irreversible.

Solution

Adsorption of methylene blue on activated charcoal is physical adsorption. Hence, it is characterised by decrease in enthalpy.
Question 5
1 / -0

Chemisorption is

A
speedy at low temperature

B
less at low temperature

C
independent of temperature

D
None of these

Solution

Chemisorption increases with rise in temperature.
Question 6
1 / -0

In adsorption, rate of physisorption increases when

A
temperature is decreased

B
temperature is increased

C
pressure is decreased

D
None of these

Solution

The rate of physical adsorption increases on decreasing the temperature and the rate decreases on increasing the temperature.
Question 7
1 / -0

The rate of physical adsorption increases on decreasing the temperature and the rate decreases on increasing the temperature.

A
The heat of adsorption is low.

B
It is specific in nature.

C
It increases with increase in temperature.

D
Only single layer adsorption is possible.

Solution

Due to strong chemical bonds formed between adsorbent and adsorbate, the heat of adsorption is generally high.
Question 8
1 / -0

Which of the following metals is used as a promoter for Haber's process?

A
Iron

B
Arsenic

C
Molybdenum

D
Potassium

Solution

Promoter is a substance added to a solid catalyst to improve its performance in the chemical reaction.

Molybdenum is used as a promoter for the iron catalyst in the Haber's process.
Question 9
1 / -0

The catalyst used in lead chamber process is

A
HCl

B
V₂O₅

C
NO

D
Pt

Solution

Nitric oxide is used as catalyst in lead chamber process.
Question 10
1 / -0

Associated colloids having aggregated particles are also known as

A
micelles

B
macromolecular colloids

C
multimolecular colloids

D
lyophilic colloids

Solution

Certain substances behave as strong electrolytes at low concentration but at higher concentrations these substances exhibit colloidal characteristics due to the formation of aggregated particles. These aggregated particles are called micelles. Micelles are called associated colloids. The formation of micelles takes place only above a particular temperature called Kraft Temperature (Tk) and above particular concentration called the critical micelle concentration (CMC). On dilution, these colloids revert back to individual ions.

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Surface Chemistry Test - 5

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Surface Chemistry Test - 5

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Question 1

Adsorbate molecules are bound to the surface of adsorbent by chemical bonds.

Chemisorption is an endothermic process.

This process increases with increase in surface area of the adsorbent.

This process is highly specific in nature.

Solution

Question 2

log k

n

1/n

log n

Solution

Question 3

1 in case of chemical adsorption

1 in case of physisorption

always greater than 10

between 0 and 1 in all cases

Solution

Question 4

The adsorption requires activation at 25oC.

The adsorption is accompanied by a decrease in enthalpy.

The adsorption increases with increase in temperature.

The adsorption is irreversible.

Solution

Question 5

speedy at low temperature

less at low temperature

independent of temperature

None of these

Solution

Question 6

temperature is decreased

temperature is increased

pressure is decreased

None of these

Solution

Question 7

The heat of adsorption is low.

It is specific in nature.

It increases with increase in temperature.

Only single layer adsorption is possible.

Solution

Question 8

Iron

Arsenic

Molybdenum

Potassium

Solution

Question 9

HCl

V2O5

NO

Pt

Solution

Question 10

micelles

macromolecular colloids

multimolecular colloids

lyophilic colloids

Solution

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The adsorption requires activation at 25^oC.

V₂O₅