Colloids

Q.

State four characteristics of a true solution.

Q.

Give two characteristics of a colloidal solution.

Q.

Explain why particles of a colloidal solution do not settle down when left undisturbed, while in the case of a suspension they do?

Q.

The mixture of starch and water will exhibit particle size:

1. Above $1000nm$

2. $1-100nm$

3. Below $0.1nm$

4. $0.1-1nm$

Q.

Is Shaving Cream A Colloid?

Q.

Which characteristic is true with respect to colloids?

1. They always have at least two phases.

2. They are only in the liquid state.

3. They are homogenous.

4. The components can be separated by sedimentation.

Q.

Is mud a colloid?

Q.

if oil is being poured in water they don't mix but when detergent is added to it the water and oil get mixed why?

Q.

Why the path of light is not visible in a solution?

1. The path is not visible because light does not have particles

2. The path is not visible because scattering of light does not take place

3. The path is not visible because solution has large particles

4. The path is not visible because scattering of light takes place

Q.

Classify the following into true solution, colloid and suspension:
sodium chloride in water, oil in water, sand in water, milk, copper sulphate dissolved in water, fog

Q.

Particles in a colloid may settle down after some time. The substance added to retain particles and prevent them from settling down in a colloid is called

1. solvent

2. anti-settler

3. preservative

4. stabilizer

Q.

Give two examples of concentrates.

Q.

Egg albumin in water forms:

1. True solution

2. Colloid

3. Suspension

4. None of these.

Q.

Give an example of a liquid-liquid heterogeneous mixture. Suggest a method of separation.

Q.

Can a solution be heterogeneous?

Q.

Milk is a colloid. Select the correct statement regarding milk as colloidal solution.

1. A gas is dispersed in liquid.

2. Some sugar is dispersed in water.

3. A solid is dispersed in liquid.

4. A liquid is dispersed in liquid.

Q.

Give one example for gel.

Q.

Why do not the dispersed phase particles in a colloidal solution combine with one another?

Q.

The process used to squeeze out water from wet clothes in a washing machine is known as ____________.

Q.

Complete the table for characteristics of suspension, colloidal solution and solution.

Property	Suspension	Colloidal solution	Solution
(a) Particle size	$>100\mathrm{nm}$	……………..	……………..
(b) Nature	……………….	Heterogeneous	………………
(c) Tyndall effect	……………….	……………..	does not show
(d) Separation by ordinary filter paper	………………	Not possible	………………
(e) Brownian movement	May show	……………….	………………

Q.

Among the options given below, which of the following exhibit tyndall effect?
(i) Sunlight passing through clouds
(ii) Milk in a glass
(iii) Sunlight coming in through windows

1. Only (i)

2. Both (i) and (ii)

3. Both (ii) and (iii)

4. (i), (ii) and (iii)

Q.

Identify the following as mixture or compound. [2 MARKS]

(i) blood
(ii) common salt
(iii) sugar
(iv) brass

Q.

What is the state of the dispersed phase and dispersion medium in milk?

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.

Q.

Milk is colloid in which

1. a liquid is dispersed in the liquid

2. a solid is dispersed in the liquid

3. some sugar is dispersed in water

4. a gas is dispersed in the liquid

Q.

Which of the following is/are the properties of a colloid?

1. can be separated by filtration

2. can be made from solids, liquids, and gases

3. scatters a light beam

4. is a mixture in which the particles settle out

Q. When light passes through a colloid, it gets scattered. This is known as effect.

1. tyndall
2. dispersion
3. scattering

Q. What technique can be used to distinguish between a suspension and a colloid?

1. By heating the mixture to boiling
2. By illuminating them by a beam of light to observe scattering of light
3. By freezing the mixture to a solid state
4. By shaking and observing the components if they separate

Q.

Give one example of the colloidal solution in which solid acts as the dispersed phase and gas as the dispersion medium.

Q. The majority constituent of a colloid is called .

1. dispersed phase
2. dispersion medium
3. solute
4. solvent

Q.

Butter is a(an)_______.

1. Emulsion

2. sol

3. Gel

4. Liquid aerosol