Surface Chemistry Test

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Surface Chemistry Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

Column chromatography is based on the principle of

A
selective absorption

B
selective adsorption

C
differential absorption

D
differential adsorption

Solution

Column chromatography is one of the most useful methods for the separation and purification of both solids and liquids. This is a solid-liquid technique in which the stationary phase is a solid and the mobile phase is a liquid. The principle of column chromatography is based on differential adsorption of a substance by the adsorbent.
Question 2
1 / -0

Emulsions are colloids formed by immiscible liquids and are stabilised by adding a stabiliser. Insoluble soap acts as a stabiliser because

A
it is an electrolyte

B
it has a hydrophilic end and a hydrophobic end

C
of the cleansing action of soap

D
of the formation of soap micelle

Solution

Soap is an emulsifying agent because the molecule has a hydrophilic end and a hydrophobic end.
The hydrophobic end dissolves in the oil base and the hydrophilic end dissolves in the water base; hence, soap helps to stabilise the emulsion.
Question 3
1 / -0

Which of the following statements is true?

A
Catalyst is used to alter the values of K_p and K_c of an equilibrium reaction.

B
A large quantity of catalyst is needed for a reaction.

C
A catalyst alters the position of equilibrium in a reversible reaction.

D
A catalyst is specific in its action.

Solution

A catalyst is specific in its action.
Question 4
1 / -0

Which of the following factors are responsible for an increase in the rate of a surface-catalysed reaction?

1. A catalyst provides proper orientation for the reactant molecules to react.
2. Heat of adsorption of the reactants on a catalyst helps the reactant molecules to attain the required activation energy.
3. The catalyst increases the activation energy of the reaction.
4. Adsorption increases the local concentration of reactant molecules on the surface of the catalyst.

A
1 and 2

B
1 and 3

C
2 and 4

D
1, 2 and 3

Solution

The following two factors are responsible for the increase in the rate of surface-catalysed reactions:
1. Heat of adsorption of reactants on a catalyst helps the reactant molecules to attain the required activation energy and overcome the energy barrier.
2. Adsorption increases the local concentration of the reactant molecules on the surface of the catalyst.
Question 5
1 / -0

Which of the following electrolytes will be the most effective in coagulating blood?

A
BaCl₂

B
CaCl₂

C
NaCl

D
FeCl₃

Solution

Blood is a colloidal solution. Its coagulation can be understood by Hardy-Schulze's law, which states that the higher the charge on the active ion, the higher its efficiency to coagulate the colloidal solution. In the present case, ferric chloride has Fe³⁺ion. Hence, ferric chloride is more effective in enhancing the coagulation rate of blood and in stopping the bleeding from a cut.
Question 6
1 / -0

The autocatalyst used in the oxidation of oxalic acid by acidified KMnO₄ is

A
K₂SO₄

B
KMnO₄

C
MnSO₄

D
CO₂

Solution

The rate of oxidation of oxalic acid by acidified potassium permanganate increases as the reaction progresses. This acceleration is due to the presence of Mn²⁺ ions which are formed during the reaction. Thus, Mn²⁺ ions act as autocatalysts.
Question 7
1 / -0

The following question has four choices out of which ONLY ONE is correct.

Which of the following statements is not correct?

A
Adsorption energy for chemical adsorption is generally greater than that for physical adsorption.

B
Physical adsorption is due to van der Waals forces.

C
Physical adsorption decreases at high temperature.

D
Physical adsorption is an irreversible reaction.

Solution

Physical adsorption can be reversed by increasing the temperature. So, it is a reversible process.
Question 8
1 / -0

The efficiency of enzyme catalysis is due to its capacity to

A
form a strong enzyme-substrate complex

B
change the shape of the substrate

C
lower the activation energy of the reaction

D
form a colloidal solution in water

Solution

The efficiency of enzyme catalysis is due to its capacity to lower the activation energy of the reaction. Enzymes are biocatalysts which increase the rate of reaction without being consumed in the reaction. In case of equilibrium reactions, a catalyst helps in attaining equilibrium quickly without disturbing the equilibrium.
Question 9
1 / -0

Which of the following substances does not produce a lyophilic sol with water?

A
Starch

B
Gum

C
Gelatin

D
Metal sulphide

Solution

Metal sulphide is a hydrophobic substance, and will not form a lyophilic sol when added to water. Lyophilic sols are formed when there is a great affinity between the dispersion phase and the dispersion medium.
Question 10
1 / -0

Which of the following acts as a catalytic poison in Haber Process?

A
Platinum

B
Iron

C
Molybdenum

D
Carbon monoxide

Solution

Presence of carbon monoxide poisons the iron catalyst in the Haber Process for the synthesis of ammonia.

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Surface Chemistry Test - 4

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Surface Chemistry Test - 4

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Question 1

selective absorption

selective adsorption

differential absorption

differential adsorption

Solution

Question 2

it is an electrolyte

it has a hydrophilic end and a hydrophobic end

of the cleansing action of soap

of the formation of soap micelle

Solution

Question 3

Catalyst is used to alter the values of Kp and Kc of an equilibrium reaction.

A large quantity of catalyst is needed for a reaction.

A catalyst alters the position of equilibrium in a reversible reaction.

A catalyst is specific in its action.

Solution

Question 4

1 and 2

1 and 3

2 and 4

1, 2 and 3

Solution

Question 5

BaCl2

CaCl2

NaCl

FeCl3

Solution

Question 6

K2SO4

KMnO4

MnSO4

CO2

Solution

Question 7

Adsorption energy for chemical adsorption is generally greater than that for physical adsorption.

Physical adsorption is due to van der Waals forces.

Physical adsorption decreases at high temperature.

Physical adsorption is an irreversible reaction.

Solution

Question 8

form a strong enzyme-substrate complex

change the shape of the substrate

lower the activation energy of the reaction

form a colloidal solution in water

Solution

Question 9

Starch

Gum

Gelatin

Metal sulphide

Solution

Question 10

Platinum

Iron

Molybdenum

Carbon monoxide

Solution

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Catalyst is used to alter the values of K_p and K_c of an equilibrium reaction.

BaCl₂

CaCl₂

FeCl₃

K₂SO₄

KMnO₄

MnSO₄

CO₂