Surface Chemistry Test

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Surface Chemistry Test - 72

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Weekly Quiz Competition

Question 1
1 / -0

Which requires catalyst

A
$$S+O_{2}\rightarrow SO_{2}$$

B
$$2SO_{2}+O_{2}\rightarrow 2SO_{3}$$

C
$$C+O_{2}\rightarrow CO_{2}$$

D
All

Solution

$$ SO_{2}g(g)+O_{2}()\xrightarrow[Asbetos\ (promoter)]{Pt- catalyst }2SO_{3}(g) $$

So, option B is correct.
Question 2
1 / -0

In adsorption of oxalic acid on activated charcoal, the activated charcoal is known as:

A
Adsorbent

B
Absorbate

C
Adsorber

D
Absorber

Solution

According to definition of adsorbent, one is the solid or the liquid on which adsorption occurs and it is called adsorbent.

Option A is correct.
Question 3
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Which one of the following is an incorrect statement for physisorption?

A
It is a reversible process

B
It requires less heat of adsorption

C
It requires activation energy

D
It takes place at low temperature

Solution

Physisorption is a process in which the particles of adsorbate are held to the surface of adsorbent by physical forces hence does not requires activation energy.
Question 4
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Adam's catalyst is

A
Platinum

B
Iron

C
Molybdenum

D
Nickel

Solution

Generally transition elements acts as catalysts. Adam's catalyst is another name of platinum based catalyst ($$PtO_2.xH_2O$$).
Question 5
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If some gelatin is mixed in collodial solution of gold, then it does

A
Coagulation of gold

B
Peptization of gold

C
Protection of gold sol

D
Protection of gelatin

Solution

Gold sol is a solvent repelling sol i.e., a lyophobic sol and unstable in nature. Addition of gelatin stabilises the gold sol because gelatin forms lyophilic sol and act as a protective colloid.
Question 6
1 / -0

Colloidal solution of arsenious sulphide can be prepared by

A
Electrodispersion method

B
Peptization

C
Double decompositon

D
Hydrolysis

Solution

Arsenious sulphide can be prepared by double decomposition reaction as shown below.

$$ As_{2}O_{3}+3H_{2}S\rightarrow As_{2}S_{3}+3H_{2}O $$
Question 7
1 / -0

The decomposition of $$ H_{2}O_{2} $$ can be slows down by the addition of small amount of phosphoric acid which act as_________

A
Promoter

B
Inhibitor

C
Detainer

D
Stopper

Solution

Inhibitors are also known as negative catalyst.

Option B is correct.
Question 8
1 / -0

Catalyst used in the oxidation of $$SO_{2}\rightarrow SO_{3}$$

A
Nickel

B
$$ZnO.Cr_{2}O_{3}$$

C
$$V_{2}O_{5}$$

D
Iron

Solution

$$ \underset{(g)}{2SO_{2}}+\underset{(g)}{O_{2}}\xrightarrow[catalyst]{V_{2}O_{5}}2SO_{3} $$

So, option C is correct.
Question 9
1 / -0

Physical adsorption is inversely proportional to the_____________

A
Volume

B
Concentration

C
Temperature

D
All of these

Solution

Physical adsorption decreases with increase of temperature.

Option C is correct.
Question 10
1 / -0

Activated charcoal is used to remove colouring from pure substances. It works by

A
Oxidation

B
Reduction

C
Bleaching

D
Adsorption

Solution

It has been observed that the surface of a soild (or liquid) has the tendency to attract and retain the molecules of other immiscible phase with it is brought into contact. These molecules remain only at the surface and do not go deeper into bulk. This tendency of accumulation of molecular species at the surface than in the bulk of a solid (or liquid) it termed adsorption.

Option D is correct.

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Surface Chemistry Test - 72

Result

Surface Chemistry Test - 72

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Question 1

$$S+O_{2}\rightarrow SO_{2}$$

$$2SO_{2}+O_{2}\rightarrow 2SO_{3}$$

$$C+O_{2}\rightarrow CO_{2}$$

All

Solution

Question 2

Adsorbent

Absorbate

Adsorber

Absorber

Solution

Question 3

It is a reversible process

It requires less heat of adsorption

It requires activation energy

It takes place at low temperature

Solution

Question 4

Platinum

Iron

Molybdenum

Nickel

Solution

Question 5

Coagulation of gold

Peptization of gold

Protection of gold sol

Protection of gelatin

Solution

Question 6

Electrodispersion method

Peptization

Double decompositon

Hydrolysis

Solution

Question 7

Promoter

Inhibitor

Detainer

Stopper

Solution

Question 8

Nickel

$$ZnO.Cr_{2}O_{3}$$

$$V_{2}O_{5}$$

Iron

Solution

Question 9

Volume

Concentration

Temperature

All of these

Solution

Question 10

Oxidation

Reduction

Bleaching

Adsorption

Solution

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