Metals and Non-Metals

Class VIII Science
HOTS for Metals and Non-Metals

1.   Explain displacement reaction with the help of an activity.

2.   Explain the reaction of non-metals with oxygen with the help of an acitivity.

3.   Write the uses of metals and non-metals.

4.   Write the difference between metals and non-metals on the basis of their physical properties.

5.   Name two most ductile metals.

6.   Sodium is stored in kerosene. Why?

7.   What are oxides? Write the nature of metallic and non-metallic oxides.

8.   Explain displacement reaction with the help of an example.

9.   Explain the reactions of metals and non-metals with (i) Acids (ii) Air (iii) Water.

10.   Write the uses of metals and non-metals in our daily life.

Choose the correct option:

1.   The most reactive metal is:

        (a) Iron

(b) Gold

(c) Zinc

(d) Potassium.

2.   The liquid metal at room temperature

        (a) Mercury

(b) Bromine

(c) Sodium

(d) Gold.

3.   Non-metals are:

        (a) generally liquids

(b) generally gases

        (c) generally solids and gases

(d) generally gases and liquids.

4.   The metal which is stored in kerosene:

        (a) Phosphorus

(b) Magnesium

(c) Sodium

(b) Magnesium

5.   The non-metal which is liquid at room temperature is:

        (a) Carbon

(b) Iodine

(c) Bromine

(d) Chlorine.

6.   Materials around us can be classified into

        (a) Elements and compounds

(b) Metals and non-metals

        (c) Acids and bases

(d) None of these.

7.   All metals are solids except

        (a) Sodium

(b) Calcium

(c) Mercury

(d) Hydrogen.

8.   Metal oxides are of nature

        (a) Acidic

(b) Basic

(c) Neutral

(d) All of these.

9.   The metal which can be cut with a knife

        (a) Sodium and potassium

(b) Barium and calcium

        (c) Sodium and mercury

(d) Potassium and calcium.

10.   When non-metals react with water then

        (a) Hydrogen gas is formed

        (b) Carbon dioxide gas is formed

        (c) Non-metals do not react with water

        (d) None of these.

Answers

.   What do you mean by displacement reaction?

2.   Give one example of displacement reaction.

3.   Have you ever seen a blacksmith beating an iron piece? Do you find a change in the shape of these pieces on beating? Would you expect a similar change in wood log on beating?

4.   What is malleability? Name two most malleable metals.

5.   Explain that metals are good conductors of electricity with the help of an activity.

6.   List some physical properties of the metals.

7.   Write some physical properties of non-metals.

8.   What happens when a magnesium ribbon is heated in presence of air?

9.   What happens when a copper vessel is exposed in moist air?

10.   Explain the reaction of sodium and water, with the help of an activity.