Surface Chemistry Test

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Surface Chemistry Test - 27

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Question 1
1 / -0

Milk is an example of :

A
Suspension

B
True solution

C
Emulsion

D
None of the above

Solution

Milk is an emulsion of fat and water, along with other components.In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase). Examples of emulsions include vinaigrettes, homogenized milk, mayonnaise, and some cutting fluids for metal working.
Question 2
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An example of a colloid which is an emulsion is :

A
Wipped cream

B
Mayonnaise

C
Fog

D
Gelatin

Solution

Mayonnaise often abbreviated as mayo is a thick, creamy dressing often used as a condiment.
It is a stable emulsion of oil, egg yolk, and acid, either vinegar or lemon juice, with many options for embellishment with other herbs and spices. It is an emulsion.

Whereas Whipped cream is a colloid. It consists of a gas in a liquid, so it is foam, Fog is an example of liquid aerosol, Gelatin is a sol.
Hence the correct option is B.
Question 3
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Soap molecules have two parts - a polar and a non-polar. When soap is added to water:

A
both parts dissolve in water

B
non-polar part dissolves in water

C
polar part dissolves in water

D
both parts remain undissolved in water and form hydrocarbon layer

Solution

As we know that like dissolved like, polar part dissolves in water, since water is a polar solvent.
Question 4
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Hard soaps are:

A
calcium salts of higher fatty acids

B
magnesium salts of higher fatty acids

C
potassium salts of higher fatty acids

D
sodium salts of higher fatty acids

Solution

Sodium salts of higher fatty acids are called hard soaps. A good example is sodium stearate $$(C_{12}H_{35}COONa)$$.
Question 5
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Cod liver is an example of:

A
oil emulsion

B
oil in water emulsion

C
water in oil emulsion

D
water in water emulsion

Solution

The emulsion in which water forms the dispersed phase, and the oil acts as the dispersion medium is called a water-in-oil emulsion. These emulsions are also termed oil emulsions. Butter and cold cream are typical examples of these types of emulsions. Other examples are cod liver oil etc.
Cod liver oil is a dietary supplement derived from liver of cod fish. As with most fish oils, it contains the omega-3 fatty acids eicosapentaenoic acid and docosahexaenoic acid.
Option C is correct.
Question 6
1 / -0

Which of these can be one of the uses of colloids?

A
Colloids act as transport vector

B
Colloids are used in intravenous therapy

C
Movement of enzyme molecules in water is because of colloid action

D
All of the above

Solution

Colloid acts as a transport vector of different contaminants in water surfaces. For example, heavy metals and radionucleides are absorbed on colloid surface and are carried throughout the water
Enzymes, which are important biomolecules in human body, freely move about in the water because of colloid action.
Colloids are used in intravenous therapy where they increase the intravascular volume and maintain a high colloid osmotic pressure in the blood

Question 7

1 / -0

Which one of the following is correctly matched?

Aerosol-smoke

Foam-mist

Emulsion-curd

All of these

Solution

Dispersed Phase	Dispersion Medium	Colloidal solution	Example
Solid	Liquid	Sol	Mud
Solid	Solid	Solid sol	Gems
Solid	Gas	Aero sols	Smoke
Liquid	Solid	Gel	Curd, Cheese
Liquid	Liquid	Emulsion	Milk, Cream
Liquid	Gas	Liquid aerosol	Clouds, fog, and mist
Gas	Solid	Solid foam	Pumice stone
Gas	Liquid	Foam	Whipped cream

From the above table, it is clear that the correct option is aerosol. For example, smoke. In this solid, the dispersed phase is suspended in a gas dispersion medium.

Question 8
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Which one of the following is an emulsion?

A
Milk

B
Soap lather

C
Butter

D
Vanishing Cream

Solution

An emulsion is a liquid dispersed in either a liquid or solid.

Milk is an emulsion. It is an example of oil in water emulsion. It consists of particles of liquid fat dispersed in water.

Hence, option (A) is the correct answer.
Question 9
1 / -0

Colloidal sols are more effective for medical purposes because:

A
they have smaller surface area

B
they have larger surface area

C
their assimilation is difficult

D
they can be easily prepared

Solution

Colloidal sols have larger surface area which provides larger sites for reactions.So,they are more effective for medical purposes.
Question 10
1 / -0

Delta formation at the mouth of river takes place by:

A
coagulation of negative salt ions and positive river particles

B
coagulation of positive salt ions and negative river particles

C
coagulation of positive salt ions and positive river particles

D
coagulation of negative salt ions and negative river particles

Solution

River water contains charged colloidal particles of clay, sand and many other materials. Sea water is very big store house of a variety of electrolytes dissolved in it. As soon as river water comes in contact with sea water coagulate the suspended colloidal particles which ultimately settle down at the point of contact. Thus the level of the river bed rises. As a result, water adopts a different course and delta is formed in due course of time.

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Surface Chemistry Test - 27

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Surface Chemistry Test - 27

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SHARING IS CARING

Question 1

Suspension

True solution

Emulsion

None of the above

Solution

Question 2

Wipped cream

Mayonnaise

Fog

Gelatin

Solution

Question 3

both parts dissolve in water

non-polar part dissolves in water

polar part dissolves in water

both parts remain undissolved in water and form hydrocarbon layer

Solution

Question 4

calcium salts of higher fatty acids

magnesium salts of higher fatty acids

potassium salts of higher fatty acids

sodium salts of higher fatty acids

Solution

Question 5

oil emulsion

oil in water emulsion

water in oil emulsion

water in water emulsion

Solution

Question 6

Colloids act as transport vector

Colloids are used in intravenous therapy

Movement of enzyme molecules in water is because of colloid action

All of the above

Solution

Question 7

Aerosol-smoke

Foam-mist

Emulsion-curd

All of these

Solution

Question 8

Milk

Soap lather

Butter

Vanishing Cream

Solution

Question 9

they have smaller surface area

they have larger surface area

their assimilation is difficult

they can be easily prepared

Solution

Question 10

coagulation of negative salt ions and positive river particles

coagulation of positive salt ions and negative river particles

coagulation of positive salt ions and positive river particles

coagulation of negative salt ions and negative river particles

Solution

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