Surface Chemistry Test

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Surface Chemistry Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

The particles of a protein sol under the electric field migrate towards_______. At isoelectric pH.

A
anode; acidic group ionized

B
cathode; basic group ionized

C
neither of the electrodes; neither basic nor acidic group ionized

D
neither of the electrodes; both basic and acidic groups equally ionized

Solution

At isoelectric pH, the particles of a protein sol under the electric field migrate towards neither of the electrodes; both basic and acidic groups equally ionized.
Question 2
1 / -0

Which of the following statement is correct?

A
Latex is an example of solid – in – liquid sol

B
none of the above is correct

C
Latex is a negative sol

D
Latex is a positive sol

Solution

Latex is a negative sol.
Latex is an emulsion in which the rubber particles forming emulsion are
stabilized by various proteins.
Question 3
1 / -0

Organic colloids can be

A
Both Starch and Soaps

B
Soaps

C
Starch

D
Ferric hydroxide sol

Solution

Organic colloids can be homo – polar sols (rubber in benzene), hydroxyl
sols (starch), heteropolar sols (protein, soaps etc.)
Question 4
1 / -0

Which of the following statement is correct?

A
Both (Peptization is the process of transforming a freshly prepared precipitate) and (Sometimes peptization is brought about by repeated washing of a precipitate) are correct

B
Peptization is the process of transforming a freshly prepared precipitate into colloidal form.

C
Sometimes peptization is brought about by repeated washing of a precipitate

D
Peptization is the process of transforming a precipitate into colloidal form.

Solution

Only freshly prepared precipitates can be peptized, so (a) is wrong.
A colloidal solution of BaSO₄ can be obtained by washing precipitate of
BaSO₄ several times. Silver halides also undergo peptization on
repeated washings. Pure water is not used for washings.
Question 5
1 / -0

The surfactant that will form micelles in aqueous solution at the lowest molar concentration at ambient conditions is

A
CH₃(CH₂)₆COO^-Na+

B
CH₃(CH₂)₁₁COONa⁺

C
CH₃(CH₂)₁₁N(CH₃)₃Br^-

D
CH₃(CH₂)₁₅N(CH₃)₃Br^-

Solution

Larger the chain length of the ion (or molecule), forming micelles, the smaller will be molar concentration required for micelle formation.
Question 6
1 / -0

About the oil – in – water type emulsion, which of the following statements is not true?

A
On addition of oil, separate layer of oil is formed

B
Addition of an electrolyte causes the conductivity of the emulsion to increase

C
On addition of small amount of water, no separate layer of water appears

D
Addition of small amount of oil soluble dye renders the entire emulsion colored.

Solution

Since oil is the inner (dispersed) phase, the added dye will not be dissolved in the emulsion.
Question 7
1 / -0

Hydrophilic substances

A
have greater concentration in the surface layer than the bulk of the solution

B
lower both the surface tension and viscosity of water

C
lower the surface tension and raise the viscosity of water

D
raise both the surface tension and viscosity of water

Solution

Hydrophilic substances has lower surface tension and raise the viscosity of water and have greater concentration in the surface layer than the bulk of the solution.
Question 8
1 / -0

During electro osmosis of Fe(OH)₃ sol

A
sol particles move towards cathode

B
the dispersion medium moves towards anode

C
the sol particles do not move in either direction

D
sol particles move towards anode

Solution

In electro osmosis, the sol particles are prevented from migration
whereas the dispersion medium migrates in the direction opposite to those of particles. Here, the medium is negatively charged.
Question 9
1 / -0

In the preparation of an emulsion of an organic liquid and water, the emulsifier

A
molecules orient at the interface of the two liquids, the polar ends facing water phase.

B
lowers the interfacial energy in some cases and raises it in other cases

C
lowers the interfacial energy between the two liquids

D
raises the interfacial energy between the disperse phase and dispersion medium

Solution

Statement “b” and “c” is wrong about the emulsifier.

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Surface Chemistry Test - 3

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Question 1

anode; acidic group ionized

cathode; basic group ionized

neither of the electrodes; neither basic nor acidic group ionized

neither of the electrodes; both basic and acidic groups equally ionized

Solution

Question 2

Latex is an example of solid – in – liquid sol

none of the above is correct

Latex is a negative sol

Latex is a positive sol

Solution

Question 3

Both Starch and Soaps

Soaps

Starch

Ferric hydroxide sol

Solution

Question 4

Both (Peptization is the process of transforming a freshly prepared precipitate) and (Sometimes peptization is brought about by repeated washing of a precipitate) are correct

Peptization is the process of transforming a freshly prepared precipitate into colloidal form.

Sometimes peptization is brought about by repeated washing of a precipitate

Peptization is the process of transforming a precipitate into colloidal form.

Solution

Question 5

CH3(CH2)6COO- Na+

CH3(CH2)11COONa+

CH3(CH2)11N(CH3)3 Br-

CH3(CH2)15N(CH3)3 Br-

Solution

Question 6

On addition of oil, separate layer of oil is formed

Addition of an electrolyte causes the conductivity of the emulsion to increase

On addition of small amount of water, no separate layer of water appears

Addition of small amount of oil soluble dye renders the entire emulsion colored.

Solution

Question 7

have greater concentration in the surface layer than the bulk of the solution

lower both the surface tension and viscosity of water

lower the surface tension and raise the viscosity of water

raise both the surface tension and viscosity of water

Solution

Question 8

sol particles move towards cathode

the dispersion medium moves towards anode

the sol particles do not move in either direction

sol particles move towards anode

Solution

Question 9

molecules orient at the interface of the two liquids, the polar ends facing water phase.

lowers the interfacial energy in some cases and raises it in other cases

lowers the interfacial energy between the two liquids

raises the interfacial energy between the disperse phase and dispersion medium

Solution

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CH₃(CH₂)₆COO^-Na+

CH₃(CH₂)₁₁COONa⁺

CH₃(CH₂)₁₁N(CH₃)₃Br^-

CH₃(CH₂)₁₅N(CH₃)₃Br^-