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CBSE 8th Standard Science Materials: Metals and Non-Metals Important Questions And Answers Study Material - QB365 Set D

Published on: 29/10/2025

Question Set D

CBSE 8th Standard Science Materials: Metals and Non-Metals Important Questions And Answers Study Material - QB365

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Std: 8th Standard CBSE - Science

chapter: Materials: Metals and Non-Metals - Important Questions And Answers

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Questions:

Generic 2

14 x 2 = 28

What is rust chemically known as?

Write characteristics of non-metals.

Write the different uses of metals.

What happens when magnesium ribbon is burnt in air ? How will you test for its acidic/basic nature ?

Which metal reacts neither with cold water nor with hot water?

A given non-metal forms sulphuric acid on reacting with nitric acid. Identify the non-metal.

Name the metal
(a) which reacts with dilute hydrochloric acid to produce hydrogen gas.
(b) which does not react with dilute hydrochloric acid.

Zinc sulphate forms a colourless solution in water. Will you observe any colour on adding copper turning in it?

If a metal coin is dropped on hard floor, it produces a ringing sound. What is this property of metals known as?

10.

Name two major non-metals which are present in fertilisers and enhance the growth of plants.

11.

How can you say that metals have a property of sonorousness?

12.

Name a non-metal which is kept in water

13.

Which metal is stored in kerosene?

14.

Name one metal and one non-metal which exist in liquid state at room temperature.

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Answers Key:

Generic 2

14 x 2 = 28

The rust is chemically known as iron (III) oxide.

Characteristics of non-metals:
(1) Non-metals are brittle.
(2) They can be broken into pieces on heating. (non-malleable, non-ductile)
(3) Non-metals are poor conductors of heat and electricity.
(4) They are non-sonorous.

Metals are used in making machinery, automobiles, aeroplane, trains, satellites, industrial gadgets, cooking utensils, water boilers etc.

A white coloured ash of magnesium oxide is obtained on burning ribbon. When white ash (Magnesium oxide) is dissolved, on testing, it turns red litmus paper to blue. Hence, it is basic in nature.
2Mg + O₂ ➝ 2MgO

Iron and zinc neither reacts with cold water nor with hot water but reacts with steam to produce hydrogen gas.

Sulphur.

(a) Zinc metal reacts with dilute hydrochloric acid to produce hydrogen gas.
(b) Copper metal does not react with dilute hydrochloric acid.

No, displacement reaction does not take place because copper is less reactive than zinc.

The property of metals to produce ringing sound is called sonority.

10.

(i) Nitrogen
(ii) Phosphorus

11.

Metals produce ringing sound, so they are called sonorous.

12.

Phosphorus.

13.