General Science 6th Class Chapter 7 Mixtures Solved Exercise

General Science

6th Class

Chapter 7

Mixtures

Questions

7.1 Encircle the correct option.

1. Select the one that is different from others.

a. ice        b. water        c. sodium        d. steam

2. Which is true for a compound?

a. a substance consisting of two or more elements loosely mixed together in a fixed ratio by mass

b. a substance consisting of two or more elements chemically combined in a fixed ratio by mass

c. a substance consisting of two or more elements physically mixed in any ratio by mass

d. a substance consisting of two or more metals mixed in their molten form

3. Which one of the following is not an element?

a. chlorine        b. sulphur        c. sugar        d. zinc

4. Which one of the following is non-metal?

a. phosphorus        b. aluminum        c. copper        d. magnesium

5. Which one of the following statement is false?

a. carbon, oxygen, hydrogen and silver are elements

b. water is made up of hydrogen and oxygen

c. an element is a substance, which can be decomposed by heating

d. gold is a metal

6. Which one of the following is matter?

a. heat        b. rain        c. sound        d. light

7. Which one of the following is mixture?

a. air        b. water        c. carbon dioxide        d. oxygen

8. Which one of the following is a homogeneous mixture?

a. soil        b. steel        c. graphite        d. iron

9. Which one of the following is a solution?

a. rock        b. copper        c. diamond        d. brass

10. Technique used for separation of coloured components of their mixture:

a. distillation        b. chromatography        c. sublimation        d. crystallization

7.2 Write short answers.

1. Define a solute.

Ans.

The solute is substance that dissolves in solution and present in smaller quality is called solute.

2. Define a solution

Ans.

A homogeneous mixture of two or more substance is called solution.

3. Give five examples of heterogeneous mixture.

Ans.

Salad, Pizza, Rock, sugar mixed in sand and sandwich are examples of heterogeneous mixture.

4. Give five examples of homogeneous mixture.

Ans.

Air, sugar, coffee, vinegar and steel are examples of homogeneous mixture.

5. Give three examples of alloys.

Ans.

Steel, Brass and white gold are examples of alloys.