Surface Chemistry Test

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Surface Chemistry Test - 47

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statements about a catalyst is true

A
It lowers the energy of activation

B
The catalyst altered during the reaction

C
It does not alter the equilibrium

D
All of these

Solution

All of the given options about catalyst are true.
Question 2
1 / -0

An emulsifier

A
Accelerates the dispresion

B
Homogenises the emulsion

C
Stabilizes the emulsion

D
Aids the flocculation of emulsion

Solution

In order to prepare stable emulsions, it is important to add a third component known as emulsifier or emulsifying agent in suitable amounts.
Thus it is used to stabilize the emulsion.
Question 3
1 / -0

Point out the wrong statement , Physical adsorption is characterised by

A
Attraction due to weak van der Waal's forces

B
lrreversible nature of adsorption

C
Multimolecular adsorption layers

D
Decreases in adsorption with increase in temperature
Solution
Characteristics of Physisorption are-
It is not Specific in nature.
It is a Reversible process.
It is not specific in nature.
It depends on the nature of the gas. More easily liquefiable gases are adsorbed readily.
Enthalpy of adsorption is low.
Low temperature is favorable for adsorption.
There is no necessity of activation energy.
It depends on the surface area. Hence, porous surfaces are good adsorbents.
Hence option B is incorrect.
Question 4
1 / -0

Physical adsorption

A
involves the weak attractive interaction between the adsorbent and adsorbate

B
involves the chemical interactions between the adsorbent and adsorbate

C
is irreversible in nature

D
increases with increases of temperature

Solution

Physical adsorption is weak, multilayer, non-directional and non-specific. Physisorption happens due to weak attraction forces like van der waal's forces.
Question 5
1 / -0

In physical adsorption the gas molecules are held on solid surface by

A
Chemical forces

B
Electrostatic forces

C
Gravitational forces

D
Vander waal's forces

Solution

In physisorption, the enthalpy of adsorption is very low as the accumulation of substances on the surface is due to van der Waals forces which are weak in nature.
Question 6
1 / -0

Which one of the following statement is not correct ?

A
The extent of adsorption depends on the nature of the adsorbent and adsorbate

B
The extent of adsorption depends on the pressure of the gas

C
The extent of adsorption depends in the temperature

D
The extent of adsorption has no upper limit

Solution

The extent of adsorption has an upper limit because it depends upon others factors too like, pressure, temperature and the nature of adsorbent and adsorbate.
Question 7
1 / -0

Which of the following processes does not involve catalysis

A
Haber's process

B
Thermite process

C
Ostwald process

D
Contact process

Solution

The catalyst is a substance, which lowers the activation energy of reaction because it provides an alternate pathway for reaction. Generally, catalyst increases the speed of a reaction.

The reaction involved in the thermite process is as follows:
$$ 4Al + 2Cr_2O_3\rightarrow \ 2Al_2O_3 + 4Cr $$

Apart from this, all processes are catalyzed.

Hence, option B is correct.
Question 8
1 / -0

A catalyst in a chemical reaction

A
Does not initiate a reaction

B
Increases the activation energy of the reaction

C
Changes the equilibrium constant of reaction

D
Dose not change the rate of the reaction

Solution

A catalyst can only effect the rate of reaction, but can't be involved in the reaction, thus it does not initiate a reaction.
Question 9
1 / -0

Gelatin is added to ice-creams.

A
As a coagulant

B
For taste

C
For colour

D
As a protective colloid

Solution

Ice cream is a colloid and gelatin is added to stabilize the colloid, so as to prevent its crystallization upon freezing.
Question 10
1 / -0

A catalyst is a substance which

A
Increases the rate if reaction

B
Increases the amount of the products formed in a reaction

C
Decreases the temperature required for the reaction

D
Alters the speed of the reaction remaining unchanged chemically at the end of the reaction

Solution

A catalyst is a substance which alters the rate of the reaction without being involved in the reaction.

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Surface Chemistry Test - 47

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Surface Chemistry Test - 47

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Question 1

It lowers the energy of activation

The catalyst altered during the reaction

It does not alter the equilibrium

All of these

Solution

Question 2

Accelerates the dispresion

Homogenises the emulsion

Stabilizes the emulsion

Aids the flocculation of emulsion

Solution

Question 3

Attraction due to weak van der Waal's forces

lrreversible nature of adsorption

Multimolecular adsorption layers

Decreases in adsorption with increase in temperature

Solution

Question 4

involves the weak attractive interaction between the adsorbent and adsorbate

involves the chemical interactions between the adsorbent and adsorbate

is irreversible in nature

increases with increases of temperature

Solution

Question 5

Chemical forces

Electrostatic forces

Gravitational forces

Vander waal's forces

Solution

Question 6

The extent of adsorption depends on the nature of the adsorbent and adsorbate

The extent of adsorption depends on the pressure of the gas

The extent of adsorption depends in the temperature

The extent of adsorption has no upper limit

Solution

Question 7

Haber's process

Thermite process

Ostwald process

Contact process

Solution

Question 8

Does not initiate a reaction

Increases the activation energy of the reaction

Changes the equilibrium constant of reaction

Dose not change the rate of the reaction

Solution

Question 9

As a coagulant

For taste

For colour

As a protective colloid

Solution

Question 10

Increases the rate if reaction

Increases the amount of the products formed in a reaction

Decreases the temperature required for the reaction

Alters the speed of the reaction remaining unchanged chemically at the end of the reaction

Solution

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