Gels and Emulsions

Q.

What is the range of the size of the particles of the dispersed phase in a colloidal solution?

Q.

What is an emulsion? Give examples.

Q. Identify the dispersed phase and dispersed medium in milk.

Q.

If the dispersed phase is liquid and the dispersion medium is solid, then the colloid is known as:

1. Sol

2. Emulsion

3. Gel

4. Foam

Q.

A colloid with a solid dispersed phase and liquid dispersing medium is called:

1. Foam

2. Gel

3. Sol

4. Emulsion

Q.

Match the following

Match the following:

(i) Foam	(a) smoke
(ii) Gel	(b) cell fluid
(iii) Aerosol	(c) jellies
(iv) Emulsion	(d) rubber
	(e) froth
	(f) milk

1. (i)-(e), (ii)-(c), (iii)-(a), (iv)-(f)

2. (i)-(b), (ii)-(c), (iii)-(e), (iv)-(d)

3. (i)-(d), (ii)-(b), (iii)-(a), (iv)-(e)

4. (i)-(d), (ii)-(b), (iii)-(e), (iv)-(f)

Q.

Milk is an example of water in oil emulsions

1. True

2. False

3. Ambiguous

4. Data insufficient

Q.

What are the physical states of dispersed phase and dispersion medium of a jelly, cheese and butter?

1. Dispersed phase: solid, dispersed medium: liquid

2. Dispersed phase: gas, dispersed medium: solid

3. Dispersed phase: liquid, dispersed medium: solid

4. Dispersed phase: gas, dispersed medium: solid

Q.

Give one example of a colloidal solution.

Q. Can we classify soft drink as a colloid
DISPERESED PHASE- liquid
DISPERSING MEDIUM- Gas
Type- Aerosol

Q.

Milk is an emulsion in which:

1. A gas is dispersed in water

2. Lactose is dispersed in water

3. Milk fat is dispersed in water

4. A solid is dispersed in water

Q.

a) Fog and milk both are colloidal in nature. How do they differ from each other?

b) What is the function of the fractionating column in fractional distillation?

Q.

What exactly are collides and collidal solutions?

Q. Which of the following is true regarding an emulsion?

1. It is a colloidal system in which only the dispersion medium is a liquid
2. It is a colloidal system in which only the dispersed phase is a liquid
3. It is a colloidal system in which exactly one of the dispersed phase OR the dispersion medium is a liquid
4. It is a colloidal system in which both the dispersed phase AND the dispersion medium is a liquid

Q.

Carbonated water is an example of

1. unsaturated solution.

2. saturated solution.

3. collide.

4. supersaturated solution.

Q.

What is the correct dm definition of colloidal solution?

Q.

Butter, coloured glass and jelly are examples of

1. unsaturated solution.

2. saturated solution.

3. colloid.

4. supersaturated solution.

Q.

Identify the dispersed phase and dispersion medium in the following colloid:

(a) Cheese

Q.

what is a colloid?

Q. Colloidal particles are unstable and settle down when left undisturbed.

1. True
2. False

Q.

give one example of each oil in water and water in oil emulsion?

Q.

In emulsions, the dispersion medium and dispersed phase are –

1. Both solids

2. Both gases

3. Both liquids

4. One is solid and other is liquid

Q. The size of colloidal particles is between:

1. ${10}^{-5}$ to ${10}^{-7}m$
2. ${10}^{-4}$ to ${10}^{-10}m$
3. ${10}^{-9}$ to ${10}^{-17}m$
4. ${10}^{-6}$ to ${10}^{-9}m$

Q.

Colloid

Q. Which among the following is an example of gel?

1. Smoke
2. Cheese
3. Milk
4. Fog

Q. Butter is an example of :

1. true solution
2. sol
3. gel
4. suspension

Q.

Name a colloid in which gas is dispersed in a solid medium. Give an example.

Q. The colloidal dispersions of liquids in solid media are called _________

1. lotion
2. emulsion
3. none of these
4. gel

Q. Butter is an example of :

1. true solution
2. colloidal solution
3. emulsion
4. suspension

Q. Select the correct statement regarding milk as colloidal solution.

1. A liquid is dispersed in liquid.

2. A solid is dispersed in liquid.

3. A gas is dispersed in liquid.

4. Some sugar is dispersed in water.