Surface Chemistry Test

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Surface Chemistry Test - 48

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Weekly Quiz Competition

Question 1
1 / -0

Which one of the following statements is incorrect in the case of heterogeneous catalysis

A
The catalyst lower the energy activation

B
The catalyst actually forms a compound with the reactant

C
The surface of the catalyst plays a very important role

D
There is no change in the energy of activation

Solution

In some cases, the catalyst reacts with reactant and at the end of the reaction it forms again.

Heterogeneous catalysis refers to the form of catalysis where the phase of the catalyst differs from that of the reactants. Phase here refers not only to solid, liquid vs gas but also immiscible liquids.
Question 2
1 / -0

Regarding criteria of catalysis which one of the following statements is not true

A
the catalyst is unchanged chemically at the end of the equilibrium position

B
a small quantity of catalyst is sufficient to bring about a considerable amount of reaction

C
in a reversible the catalyst alters the equilibrium position

D
the catalyst accelerates the reaction

Solution

A catalyst can increase the rate of reaction, both in forward and in backward direction but it doesn't alter the reaction in any way thus it acts without being involved in the reaction.
Question 3
1 / -0

Which of the following statement regarding catalyst is not true

A
A catalyst remains unchanged in composition and quantity at the end of the reaction

B
A catalyst does not alter the equilibrium in a reversible reaction

C
Catalyst are sometimes very specific in respect of reaction

D
Catalyst are sometimes very specific in respect of reaction

Solution

A catalyst can alter the rate of reaction in both forward and backward direction, thus option B) is not true.
Question 4
1 / -0

Which of the following is an example of 'Water in oil' type emulsion

A
Butter

B
Milk

C
Cream

D
Face cream

Solution

Butter is an "Water in oil" type emulsion.
Question 5
1 / -0

Protons accelerate the hydrolysis of esters. This is an example of

A
A heterogeneous catalysis

B
An acid-base catalysis

C
A promoter

D
A negative catalyst

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.
In hydrolysis of ester, acid forms and hydrogen ion (proton) acts as a catalyst. So, this is a example of acid-base catalyst and auto-catalyst.
Question 6
1 / -0

Emulsifiers are generally

A
Soap

B
Synthetic detergents

C
Lyophilic sols

D
All of these

Solution

Emulsifiers can be all of the above mentioned options.
Question 7
1 / -0

Emulsifier is mixed to

A
Increase the stability of emulsion

B
Decrease the stability of emulsion

C
Change oil into water like emulsion

D
None of these

Solution

to increase the stability of the emulsion
Question 8
1 / -0

White of an egg is partly coagulated by heating which can be again obtained back by some pepsin and little HCl. This process is called

A
Peptization

B
Coagulation

C
Precipitation

D
None of these

Solution

This process is known as peptization.
Question 9
1 / -0

Liquid - liquid sols are known as

A
Aerosols

B
Emulsions

C
Foam

D
Gel

Solution

Liquid-liquid sols are known as emulsions.
Question 10
1 / -0

In a homogeneous catalysis

A
The catalyst and the reactants should be gases

B
The catalyst and the reactants should from a single phase

C
Catalyst and the reactants are all solids

D
The catalyst and the reactions are all liquids

Solution

It is known as homogeneous catalysis if the state of catalyst and the reactants are same.

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Surface Chemistry Test - 48

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Surface Chemistry Test - 48

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Question 1

The catalyst lower the energy activation

The catalyst actually forms a compound with the reactant

The surface of the catalyst plays a very important role

There is no change in the energy of activation

Solution

Question 2

the catalyst is unchanged chemically at the end of the equilibrium position

a small quantity of catalyst is sufficient to bring about a considerable amount of reaction

in a reversible the catalyst alters the equilibrium position

the catalyst accelerates the reaction

Solution

Question 3

A catalyst remains unchanged in composition and quantity at the end of the reaction

A catalyst does not alter the equilibrium in a reversible reaction

Catalyst are sometimes very specific in respect of reaction

Catalyst are sometimes very specific in respect of reaction

Solution

Question 4

Butter

Milk

Cream

Face cream

Solution

Question 5

A heterogeneous catalysis

An acid-base catalysis

A promoter

A negative catalyst

Solution

Question 6

Soap

Synthetic detergents

Lyophilic sols

All of these

Solution

Question 7

Increase the stability of emulsion

Decrease the stability of emulsion

Change oil into water like emulsion

None of these

Solution

Question 8

Peptization

Coagulation

Precipitation

None of these

Solution

Question 9

Aerosols

Emulsions

Foam

Gel

Solution

Question 10

The catalyst and the reactants should be gases

The catalyst and the reactants should from a single phase

Catalyst and the reactants are all solids

The catalyst and the reactions are all liquids

Solution

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