Sol

Q.

A colloidal system consisting of a gas dispersed in a solid is called a/an:

1. Aerosol

2. Solid Sol

3. Foam

4. Gel

Q.

Define the following :

(a) Sol (b) Aerosol (c) Emulsion (d) Foam

Give one example of each.

Q.

Give 5 examples each for :

(a) Aerosol

(b) Emulsion

Q. Match the column I and column II
$\begin{array}{cccc}& \text{Column I}& & \text{Column II}\\ \text{a)}& \text{Aerosol}& \text{i.}& \text{Shaving cream}\\ \text{b)}& \text{Foam}& \text{ii.}& \text{Face cream}\\ \text{c)}& \text{Gel}& \text{iii.}& \text{Clouds}\\ \text{d)}& \text{Emulsions}& \text{iv.}& \text{Jelly}\end{array}$

1. a-iii, b-i, c-ii, d-iv
2. a-ii, b-i, c-iv, d-iii
3. a- iii, b- i, c-iv, d-ii
4. a-i, b-iv, c-ii, d-iii

Q.

Milk is an example of _____________ . (suspension/colloid).

Q.

Automobile exhaust and smoke coming out from the vehicles and industries are the examples of which type of colloid?

1. Solid in solid

2. Solid in liquid

3. Liquid in solid

4. Solid in gas

Q. Question 37
A group of students took an old shoe box and covered it with a black paper from all sides. They fixed a source of light (a torch) at one end of the box by making a hole in it and made another hole on the other side to view the light. They placed a milk sample contained in a beaker/tumbler in the box as shown in the Figure. They were amazed to see that milk taken in the tumbler was illuminated. They tried the same activity by taking a salt solution but found that light simply passed through it?
(a) Explain why the milk sample was illuminated? Name the phenomenon involved.
(b) Same results were not observed with a salt solution. Explain.
(c) Can you suggest two more solutions which would show the same effect as shown by the milk solution?

Q. Which type of a colloid is milk of magnesia?

1. Sol
2. Aerosol
3. Emulsion
4. Foam

Q. Question 4 (c)
Explain the following giving examples.
c. Colloid

Q. A liquid is found to scatter a beam of light but leaves no residue when passed through the filter paper. The liquid can be described as a/an

1. suspension
2. oil
3. colloidal sol
4. true solution

Q.

Curd is an example of a gel

1. True
2. False

Q. Which of the following is an example of gel?​
A. Smoke​
B. Cheese​
C. Milk​
D. Fog​

Q.

Explain the term Colloid using example.

Q. A) Tyndall effect is observed in colloids but not in solutions.
Explain.
B) Give three examples of Tyndall effect observed around us.

[5 Marks]
[Exemplar]
[Tyndall Effect]

Q.

Hi

Can you write the common example of colloids?

Q. Question 2
How are sol, solution and suspension different from each other?

Q. Which of the following characteristic is true with respect to colloids?

1. They always have two phases.
2. The dispersion medium is always in a liquid state.
   
3. They are homogeneous.
4. The components can be separated by filtration.

Q. Which of the following will show “Tyndall effect”?
a. Salt solution
b. Milk
c. Copper sulphate solution
d. Starch solution

Q. Which among the following has small particle size?

1. Salt water
2. Milk
3. Blood
4. Smoke

Q. What is the best description of blood?

1. Sol
2. Foam
3. Solution
4. Aerosol

Q. Explain colloid with examples?

Q. Name the type of colloid in the following mixtures:
a. Milk of magnesium
b. Smoke
c. Face cream
d. Smog

Q. Which among the following has small particle size?

1. Smoke
2. Salt water
3. Milk
4. Blood

Q. Identify the correct statement(s) with respect to a suspension and a colloidal solution:

1. In a suspension, the particles cannot be seen by the naked eye whereas in a colloidal solution, they can be.
2. In a suspension, the particles can be seen by the naked eye whereas in a colloidal solution, they cannot be.
3. Both can scatter light and make its path visible.
4. A suspension can scatter light but a colloidal solution cannot.