Surface Chemistry Test

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Surface Chemistry Test - 28

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Weekly Quiz Competition

Question 1
1 / -0

The pollutants released by jet aeroplanes in the atmosphere as chlorofluorocarbons are called:

A
photochemical oxidants

B
photochemical reductants

C
aerosols

D
physical pollutants

Solution

Aerosols are emitted into the air in the form of vapour or fine mist. Jet airplanes emit aerosols containing chlorofluorocarbons $$(CCl_{2}F_2)$$ and $$(CCl_3F)$$. The aerosols deplete ozone layer in the atmosphere.
Question 2
1 / -0

Argyrol is a:

A
Ferric oxide sol

B
Silver sol

C
Gold sol

D
Arsenic sol

Solution

Argyrol is a silver sol and is used as an eye lotion.It is manufactured in the chemical industry to pharmaceutical grade only, using denatured pharmaceutical-grade protein for ophthalmic application and elemental silver, to produce the silver protein molecule.
Question 3
1 / -0

Which of the following is NOT used in making photographic plates using colloidal sols?

A
Silver bromide

B
Gelatin

C
Glass plate

D
Argyrol

Solution

Argyrol is a silver sol and is used as an eye lotion. Silver bromide, gelatin and glass plate are used in the making photographic plates.
Question 4
1 / -0

Detergents are better than soaps because:

A
they wash clothes better

B
they absorb the hardness of water

C
they are less affected by hard water

D
they are less soapy

Solution

Detergents are better than soaps because they are less affected by hard water, as the hydrocarbon chains in detergents do not precipitate with calcium, magnesium and other metal ions.
Question 5
1 / -0

Sulphur sol contains :

A
discrete $$S-$$atoms

B
discrete $$S-$$molecules

C
large aggregates of $$S-$$molecules

D
water dispersed in solid sulphur
Solution
Hint: A sol is a type of colloid that has solid particles suspended in a liquid medium.
Explanation:
- Sulphur sols are highly dispersed sols containing nearly $$0.08\%$$ of sulphur and are prepared by reduction of sulphur dioxide.
- It can also be prepared by passing a very hot sulphur vapour into water that is air free.
- A large aggregate of sulphur would be formed.
- During the formation of sol large aggregates are formed. Hence, options (A),(B) and (D) can't be the answer.
Final Answer: Hence, the correct answer is option $$C$$.
Question 6
1 / -0

Soap action is due to:

A
micelle formation

B
colloidal dispersion of micelles in water

C
oil drop dispersal

D
All of these

Solution

When soap is dissolved in water, its hydrophobic ends attach themselves to dirt and remove it from the cloth.
First, the molecules of soap arrange themselves in micelle formation and trap the dirt at the center of the cluster.
These micelles remain suspended in water like particles in colloidal solution.
The various micelle present in water does not come together to form a precipitate as each micelle repels the other because of the ion-ion repulsion.
Thus, the dust particle remains trapped in micelles(which remains suspended) and are easily rinsed away with water.
Hence, soap micelles remove dirt by dissolving it in water
Question 7
1 / -0

The substance added to increase the stability of a lyophobic sol are called:

A
promoters

B
stabilizers

C
inhibitors

D
poison

Solution

Stabilizers are the substance that are added in lyophobic sols to increase their stability.
Examples of stabilizers are an ammonium salt and a citrate.
Question 8
1 / -0

A colloidal sol can be prepared by:

A
breaking the bulky substance into fine particles of colloidal dimensions

B
increasing the size of molecular particles to form larger aggregates.

C
mixing a substance directly with a dispersion medium

D
all of the above

Solution

A colloidal sol can be prepared by :
1) Mixing directly a substance with a dispersion medium.
2)By formation of aggregates by increasing size of molecular particles.
3)Breaking the bulky substance into fine particles of colloidal dimensions
Question 9
1 / -0

Which sol can be prepared directly by mixing the dispersed phase with dispersion medium?

A
Lyophobic sol

B
Lyophilic sol

C
Both

D
None

Solution

Lyophilic sol is those in which the dispersed phase exhibits a definite affinity for the dispersion medium(liquid) or the solvent. For eg. Dispersion of starch, gum, & protein in water. The affinity of sol particles for the medium is due to hydrogen bonding with water(dispersion medium). They may have little or no charge at all & they do not exhibit Tyndall effect. These sols are reversible in nature i.e., if two constituents of the sol are separated by any means (such as evaporation), then the sol can be prepared again by simply mixing the dispersion medium with the dispersion phase and shaking the mixture.
Question 10
1 / -0

The colour of the colloidal solution formed by combination of ferric chloride and freshly prepared ferric hydroxide is:

A
red

B
reddish-brown

C
green

D
grey

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Surface Chemistry Test - 28

Result

Surface Chemistry Test - 28

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SHARING IS CARING

Question 1

photochemical oxidants

photochemical reductants

aerosols

physical pollutants

Solution

Question 2

Ferric oxide sol

Silver sol

Gold sol

Arsenic sol

Solution

Question 3

Silver bromide

Gelatin

Glass plate

Argyrol

Solution

Question 4

they wash clothes better

they absorb the hardness of water

they are less affected by hard water

they are less soapy

Solution

Question 5

discrete $$S-$$atoms

discrete $$S-$$molecules

large aggregates of $$S-$$molecules

water dispersed in solid sulphur

Solution

Question 6

micelle formation

colloidal dispersion of micelles in water

oil drop dispersal

All of these

Solution

Question 7

promoters

stabilizers

inhibitors

poison

Solution

Question 8

breaking the bulky substance into fine particles of colloidal dimensions

increasing the size of molecular particles to form larger aggregates.

mixing a substance directly with a dispersion medium

all of the above

Solution

Question 9

Lyophobic sol

Lyophilic sol

Both

None

Solution

Question 10

red

reddish-brown

green

grey

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