Surface Chemistry Test

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Surface Chemistry Test - 67

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Weekly Quiz Competition

Question 1
1 / -0

Which metal sol (dispersion medium being water) cannot be prepared by Bredig's are method?

A
$$K$$

B
$$Cu$$

C
$$Au$$

D
$$Pt$$

Solution
Question 2
1 / -0

Which of the following reaction is not used in the preparation of colloidal solution?

A
$$2H_{2}S + SO_{2} \rightarrow 3S + 2H_{2}O$$

B
$$2Mg + CO_{2} \rightarrow 2MgO + C$$

C
$$FeCl_{3} + 3H_{2}O \rightarrow Fe(OH)_{3} + 3HCl$$

D
$$2AuCl_{3} + 3SnCl_{2} \rightarrow 2Au + 3SnCl_{4}$$

Solution
Question 3
1 / -0

Select the correct statement(s)

A
If the critical micelle concentration (CMC) of a soap is $$10^{-3} M$$, then $$10^{-4} M$$ solution of this soap will have colloidal nature.

B
Charge on the colloidal particles may be determined with the help of dialysis.

C
Peptization is the process of conversion of a colloidal sol into precipitate by adding some electrolyte.

D
When some oil-soluble dye is added in the water in oil emulsion, the background becomes colored.
Question 4
1 / -0

The main function of a catalyst in speeding up a reaction is

A
To increase the rate of the forward reaction

B
To change the reaction path so as to decrease the energy of activation for the reaction

C
To reduce the temperature at which the reaction can occur

D
To increase the energy of the molecules of the reactants

Solution

Catalyst decrease energy of activation. Thus it's main function is to speed up the reaction.
Option B is correct.
Question 5
1 / -0

If the absorbate is held on a surface by weak van der Waal's forces the absorption process is called

A
physical adsorption

B
chemical adsorption

C
heat of adsorption

D
enthalpy of adsorption

Solution

The adsorption in which molecules of adsorbate are held on the surface of adsorbent by Van der Waals forces or weak physical forces is called as physical adsorption or Van der Waals adsorption or physisorption.
Question 6
1 / -0

Oil soluble dye is mixed with water in oil emulsion. Then

A
dispersion medium is coloured

B
different phase is coloured

C
both coloured

D
none is coloured

Solution
Question 7
1 / -0

When the temperature is lowered and pressure is raised the adsorption of a gas on solid

A
decreases

B
increases

C
remains unaffected

D
decreases first then increases

Solution

When the temperature is lowered then there will also occur a decrease in kinetic the energy of the molecules of gas

Thus adsorption increases.
Question 8
1 / -0

A catalyst increases the rate of a chemical reaction by_________

A
increasing the activation energy

B
decreasing the activation energy

C
reacting with reactants

D
reacting with products

Solution

Catalyst increases the rate by decreasing the activation energy.
Question 9
1 / -0

A reaction is catalysed by $$'X'$$. Here $$'X'$$

A
Decreases the rate constant of reaction

B
Does not affect the equilibrium constant of reaction

C
Decreases the enthalpy of reaction

D
Decreases the activation energy

Solution

Catalyst reduce the activation energy for reaction and thus increase the rate of reaction.
Question 10
1 / -0

Which among the following statement is false ?

A
The adsorption may be monolayered or multilayered

B
Particle size of adsorbent will not affect the amount of adsorption

C
Increases of pressure increases amount of adsorption

D
Increases of temperature may decrease the amount of adsorption

Solution

The extent of adsorption depends directly upon the surface area of the adsorbent, i.e. larger the surface area of the adsorbent, greater is the extent of adsorption.

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Re-Attempt Weekly Quiz Competition

Surface Chemistry Test - 67

Result

Surface Chemistry Test - 67

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SHARING IS CARING

Question 1

$$K$$

$$Cu$$

$$Au$$

$$Pt$$

Solution

Question 2

$$2H_{2}S + SO_{2} \rightarrow 3S + 2H_{2}O$$

$$2Mg + CO_{2} \rightarrow 2MgO + C$$

$$FeCl_{3} + 3H_{2}O \rightarrow Fe(OH)_{3} + 3HCl$$

$$2AuCl_{3} + 3SnCl_{2} \rightarrow 2Au + 3SnCl_{4}$$

Solution

Question 3

If the critical micelle concentration (CMC) of a soap is $$10^{-3} M$$, then $$10^{-4} M$$ solution of this soap will have colloidal nature.

Charge on the colloidal particles may be determined with the help of dialysis.

Peptization is the process of conversion of a colloidal sol into precipitate by adding some electrolyte.

When some oil-soluble dye is added in the water in oil emulsion, the background becomes colored.

Question 4

To increase the rate of the forward reaction

To change the reaction path so as to decrease the energy of activation for the reaction

To reduce the temperature at which the reaction can occur

To increase the energy of the molecules of the reactants

Solution

Question 5

physical adsorption

chemical adsorption

heat of adsorption

enthalpy of adsorption

Solution

Question 6

dispersion medium is coloured

different phase is coloured

both coloured

none is coloured

Solution

Question 7

decreases

increases

remains unaffected

decreases first then increases

Solution

Question 8

increasing the activation energy

decreasing the activation energy

reacting with reactants

reacting with products

Solution

Question 9

Decreases the rate constant of reaction

Does not affect the equilibrium constant of reaction

Decreases the enthalpy of reaction

Decreases the activation energy

Solution

Question 10

The adsorption may be monolayered or multilayered

Particle size of adsorbent will not affect the amount of adsorption

Increases of pressure increases amount of adsorption

Increases of temperature may decrease the amount of adsorption

Solution

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