Surface Chemistry Test

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Surface Chemistry Test - 49

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Weekly Quiz Competition

Question 1
1 / -0

A catalyst remains unchanged at the end of th reaction regarding

A
Mass

B
Physical state

C
Physical state and chemical composition

D
Mass and chemical composition

Solution

The catalyst remains unchanged because it doesn't gets involved in the reaction chemically but only increases the rate.
Question 2
1 / -0

Which of the following statement is wrong

A
Catalysts can aid a rapid reaching of the equilibrium position, but do not change the position of the equilibrium

B
Homogeneous catalysis generally involves an equilibrium reaction between at least one of the reactants and the catalyst

C
Heterogeneous catalysis involves chemisorption on the surface of the catalyst

D
Positive catalysts raise the energy of activation of the reaction they catalyse

Solution

The function of a positive catalyst is to decrease the energy of activation and hence increase the rate of reaction in forward direction, thus option D) is wrong.
Question 3
1 / -0

A cleared solution which is again converted into colloidal solution, the process is called

A
Peptisation

B
Electrolytic addition

C
Electrophoresis

D
None of these

Solution

A clear solution which is again converted into colloidal solution the process is called "coagulation"
Question 4
1 / -0

In a reversible reaction, a catalyst used

A
Increases the speed of the forward reaction

B
Decreases the speed of the backward reaction

C
Does not alter the final state of equilibrium

D
Increases the amount of the product formed

Solution

A catalyst cannot get involved in the reaction, thus it can't alter the final state.
Question 5
1 / -0

Colloidal solutions of metals like gold, silver and platinum generally prepared by using

A
Peptization

B
Bredig's arc method

C
Exchange of solvent

D
Oxidation method

Solution

The method of preparation of collodial solution of metals such as platinum, gold or silver is known as Bredig's arc method.

It consists of both dispersion and condensation. It can not be used to prepare a colloidal solution of copper and sodium.
Question 6
1 / -0

A catalyst is a substance which______________

A
is always in the same phase as in the reactants

B
alters the equilibrium in a reaction

C
does not participate in the reaction but alters the rate of reaction

D
participates in the reaction and provide an easier pathway for the same

Solution

A catalyst does not participate in the reaction but alters the rate of reaction.
Question 7
1 / -0

The catalyst used for the polymerisation of olefins is:

A
Ziegler Natta catalyst

B
Wilkinsons catalyst

C
Pd-catalyst

D
Zeises salt catalyst

Solution

Combination of $$TiCl_4$$ and $$Al(C _2H _5 )_3$$ called as Ziegler Natta catalyst, used in the synthesis of polymers of 1-alkenes (alpha-olefins) i.e. polymerization of olefins.

Wilkinson's catalyst is best known for catalyzing the hydrogenation of olefins with molecular hydrogen.

Palladium is widely used in catalytic reactions, such as in hydrogenation of unsaturated hydrocarbons.

Zeise's salt that is used for the optical resolution of alkenes.

Hence, option $$A$$ is the correct answer.
Question 8
1 / -0

Milk is an example of

A
Pure solution

B
Emulsion

C
Gel

D
Suspension

Solution

Milk is as example of emulsion
Question 9
1 / -0

Colloidal solution of gold cannot be prepared by

A
Bredig's are method

B
Mechanical dispersion

C
Reduction of gold chloride

D
Exchange of solvents

Solution

Colloidal solution of gold cannot be prepared by exchange of solvents.
Question 10
1 / -0

Which of the following methods is used for the destruction of colloids

A
Dialysis

B
Condensation

C
By ultrafilteration

D
By adding electrolyte

Solution

Methods used for the destruction of colloids are as follows:
1. Electrophoresis
2. Mixing two oppositely charged sols
3. Boiling
4. Persistent dialysis
Addition of electrolyte brings in coagulation of the sol.
Hence, option D is the correct answer.

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Re-Attempt Weekly Quiz Competition

Surface Chemistry Test - 49

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Surface Chemistry Test - 49

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SHARING IS CARING

Question 1

Mass

Physical state

Physical state and chemical composition

Mass and chemical composition

Solution

Question 2

Catalysts can aid a rapid reaching of the equilibrium position, but do not change the position of the equilibrium

Homogeneous catalysis generally involves an equilibrium reaction between at least one of the reactants and the catalyst

Heterogeneous catalysis involves chemisorption on the surface of the catalyst

Positive catalysts raise the energy of activation of the reaction they catalyse

Solution

Question 3

Peptisation

Electrolytic addition

Electrophoresis

None of these

Solution

Question 4

Increases the speed of the forward reaction

Decreases the speed of the backward reaction

Does not alter the final state of equilibrium

Increases the amount of the product formed

Solution

Question 5

Peptization

Bredig's arc method

Exchange of solvent

Oxidation method

Solution

Question 6

is always in the same phase as in the reactants

alters the equilibrium in a reaction

does not participate in the reaction but alters the rate of reaction

participates in the reaction and provide an easier pathway for the same

Solution

Question 7

Ziegler Natta catalyst

Wilkinsons catalyst

Pd-catalyst

Zeises salt catalyst

Solution

Question 8

Pure solution

Emulsion

Gel

Suspension

Solution

Question 9

Bredig's are method

Mechanical dispersion

Reduction of gold chloride

Exchange of solvents

Solution

Question 10

Dialysis

Condensation

By ultrafilteration

By adding electrolyte

Solution

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