Surface Chemistry Test

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Surface Chemistry Test - 68

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Weekly Quiz Competition

Question 1
1 / -0

When a freshly precipitated substance is converted into a colloidal solution with the help of a third substance, the process is known as

A
Coagulation

B
Peptization

C
Electrodispersion

D
Dialysis

Solution

Peptization or Deflocculation is the process responsible for the formation of converting precipitate into colloid by shaking with it an electrolyte.
Question 2
1 / -0

A catalyst is a substance which

A
Alters the equilibrium in a reaction

B
Is always in the same phase as the reactants

C
Participates in the reaction and provides easier pathway for the same

D
Does not participate in the reaction but speeds it up

Solution

A catalyst does not take part in the reaction but can speed it up. It can be recovered after the reaction.
Question 3
1 / -0

When $$KClO_{3}$$ is heated, it decomposes into $$KCl+O_{2}$$. If some $$MnO_{2}$$ is added, the reaction goes much faster because

A
$$MnO_{2}$$ decomposes to give $$O_{2}$$

B
$$MnO_{2}$$ provides heat by reacting

C
Better contact is provided by $$MnO_{2}$$

D
$$MnO_{2}$$ acts as a catalyst

Solution

$$ 2KClO_{3}\overset{MnO_{2}}{\longrightarrow}2KCl+3O_{2} $$

$$MnO_2$$ acts as a catalyst in the above reaction which enhances the reaction rate.
Question 4
1 / -0

In the adsorption of acetic acid on activated charcoal the acetic acid is an

A
Adsorber

B
Absorber

C
Adsorbent

D
Adsorbate

Solution

In the adsorption of acetic acid on activated charcoal the acetic acid is an adsorbate.
Question 5
1 / -0

In emulsions, the dispersion medium and dispersed phase are

A
Both solids

B
Both gases

C
Both liquids

D
One is solid and other is liquid

Solution

Although the terms colloid and emulsion are sometimes used interchangeably, emulsion should be used when both phases, dispersed and continuous, are liquids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase).
Question 6
1 / -0

A catalyst is used

A
Only for increasing the velocity of the reaction

B
For altering the velocity of the reaction

C
Only for decreasing the velocity of the reaction

D
All (a), (b) and (c) are correct

Solution

A catalyst is a substance, which increases the rate of reaction without itself being consumed at the end of the reaction, and the phenomenon is called catalysis. There are some catalysts which decrease the rate of reaction and such catalysts are called negative catalyst. Obviously, the catalyst accelerating the rate will be positive catalyst. However, the term positive is seldom used and catalyst itself implies positive catalyst. Catalysts are generally foreign substances but sometimes one of the product formed may act as a catalyst and such a catalyst is called "auto catalyst" and the phenomenon is called auto catalysis.
Question 7
1 / -0

In the reaction $$2SO_{2}+O_2\xrightarrow[As_{2}o_{3}]{Pt}2SO_{3},\ As_{2}O_{3}$$ acts as a

A
Auto catalyst

B
Poison

C
Promotor

D
Positive catalyst

Solution

Promoters are the substances that enhances the activity of the catalyst while the poison decreases the activity.
In the manufacturing of sulphuric acid, a step involves the reaction between $$ SO_2 $$ and $$ O_2 $$ in the presence of platinized asbestos to give $$ SO_3 $$

$$ SO_2 + O_2 \rightarrow SO_3$$
In the above reaction if the traces of arsenious oxide ( $$ As_2O_3 $$ ) is used then it acts as a catalytic poison by decreasing the activity of the reaction.
Question 8
1 / -0

What is the role of a catalyst in a catalysed reaction?

A
Lowers the activation energy

B
Increases the activation energy

C
Affects the free energy change

D
Affects the enthalpy change

Solution

All substances have average energy and before the reaction occurs energy of the reactant should be higher than the average energy. We also know that catalyst lowers the activation energy. Therefore, the rate of reaction is increased.

Therefore, the role of a catalyst in a catalysed reaction is to lower the activation energy.
Question 9
1 / -0

Which is the correct statement in case of milk

A
Milk is an emulsion of protein in water

B
Milk is an emulsion of fat in water

C
Milk is stablised by protein

D
Milk is stabiloised by fat

Solution

Milk is an emulsion with fat dispersed in water
Emulsifiers are those which are added to emulsions and can stabilize them by forming a thin film around every drop of dispersed phase and thus prevent both the liquid layers coming together.
Question 10
1 / -0

Which of the following forms a colloidal solution ion water?

A
NaCl

B
Glucose

C
Starch

D
Barium nitrate

Solution

The substance which forms the colloidal solution in water is starch. A colloidal solution is a solution in which the colloid mixes uniformly. All colloids have a Tyndall Effect, which is not exhibited by glucose. Starch is a colloid and thus when mixed with water can form the colloidal solution.

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Surface Chemistry Test - 68

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Surface Chemistry Test - 68

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SHARING IS CARING

Question 1

Coagulation

Peptization

Electrodispersion

Dialysis

Solution

Question 2

Alters the equilibrium in a reaction

Is always in the same phase as the reactants

Participates in the reaction and provides easier pathway for the same

Does not participate in the reaction but speeds it up

Solution

Question 3

$$MnO_{2}$$ decomposes to give $$O_{2}$$

$$MnO_{2}$$ provides heat by reacting

Better contact is provided by $$MnO_{2}$$

$$MnO_{2}$$ acts as a catalyst

Solution

Question 4

Adsorber

Absorber

Adsorbent

Adsorbate

Solution

Question 5

Both solids

Both gases

Both liquids

One is solid and other is liquid

Solution

Question 6

Only for increasing the velocity of the reaction

For altering the velocity of the reaction

Only for decreasing the velocity of the reaction

All (a), (b) and (c) are correct

Solution

Question 7

Auto catalyst

Poison

Promotor

Positive catalyst

Solution

Question 8

Lowers the activation energy

Increases the activation energy

Affects the free energy change

Affects the enthalpy change

Solution

Question 9

Milk is an emulsion of protein in water

Milk is an emulsion of fat in water

Milk is stablised by protein

Milk is stabiloised by fat

Solution

Question 10

NaCl

Glucose

Starch

Barium nitrate

Solution

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