Class 10 Science Chapter 3 Practice Question Answers - Metals & Non-metals

VERY SHORT Type Questions :

1. What would happen to copper vessel if it is left for a few days in humid atmosphere without being cleaned ?

2. Which chemical element is alloyed with copper to make bronze ?

3. Why do shopkeepers apply oil on tools made of iron while storing them ?

or Why do we apply oil on iron tools kept in storage ?

4. Name the metal used for making the body of aircraft.

5. Which one of the following is (a) the most reactive (b) the least reactive ?

Au, Na, Cu, Ca

6. Name one non-metal and one metal which are liquid at room temperature

7. Name an ore of zinc other than zinc oxide. By what process can this ore be converted to zinc oxide ?

8. Select the metalloids/ from amongst the following elements.

(i) Bismuth (ii) Copper (iii) Zinc (iv) Iron

9. Name a metal that offers high resistance to the passage of electricity than copper.

10. A green layer is gradually formed on a copper plate left exposed to air for a week in bath room. What could this green susbtance be ?

11. Name two metals both of which are very ductile as well as very malleable.

12. What type of reaction is involved in rusting ?

13. From amongst the metals sodium, calcium, aluminium, copper and magnesium, name the metal

(i) which reacts with water only on boiling and

(ii) another which does not react even with steam.

SHORT Type Questions :

1. An element reacts with oxygen to form an oxide which dissolves in dilute hydrochloric acid. The oxide also turns a solution of red litmus blue. Is the element a metal or a non-metal ? Explain with the help of a suitable example.

2. What is activity series of metals ? Rearrange the following metals in an increasing order of reactivity :

Aluminium, Zinc, Mercury.

3. Choose the metal (from the list given below) which can displace zinc from zinc sulphate solution. Lead, Copper, Magnesium, Silver. Write the equation of the chemical reaction involved.

4. State two ways to prevent the rusting of iron.

5. What chemical process is used for obtaining a metal from its oxide ?

6. Explain why metals replace hydrogen from acids, whereas nonmetals do not.

7. Sodium hydroxide should not be stored in aluminium containers. Why ?

8. Explain why sodium is not found in the native state.

9. Name three nonmetallic oxides which are acidic.

10. What do you mean by corrosion of metals ?

Long Type Questions :

1. Describe two methods for the concentation of ores.

2. Explain the following terms.

(a) Mettallurgy (b) Flux (c) Calcination (d) Roasting

3. Explain the method used for the extraction of aluminium from its ore. Illustrate your answer with the help of a neat, labelled diagram.

4. How does aluminium react with the following substances ?

(a) Water (b) Sulphuric acid (c) Carbon monoxide (d) Ferric oxide

5. Name the chief ore of iron. What are the three raw material used in the production of iron from its ore? With the help of a labelled diagram of a blast furnace, describe the extraction of iron from its ore. Write the chemical equation of the reactions involved in the furnace.

6. What is allotropy ? Name any four allotropic modifications of sulphur. Describe the action of heat on shulphur.

7. Draw a labelled diagram of Frasch process for mining sulphur. State the function of the following in the Frasch process.

(a) Superheated water (b) Air at high pressure.