Chapter 4

                     M ATERIALS : METALS AND NON-METALS


 

1. Which of the following can be beaten into thin sheets?

    (a) Zinc    (b) Phosphorus    (c) Sulphur    (d) Oxygen

Ans-

2. Which of the following statements is correct?

    (a) All metals are ductile.

    (b) All non-metals are ductile.

    (c) Generally, metals are ductile.

    (d) Some non-metals are ductile.

Ans-

3. Fill in the blanks. 

    (a) Phosphorus is a very _______ non-meta.

Ans-

    (b) Metals are ________ conductors of heat and _______.

Ans-

        (c) Iron is ______ reactive than copper.

Ans-

       (d) Metals react with acids to produce _______ gas.

Ans-

4. Mark 'T' if the statement is true and 'F' if it is false.

    (a) Generally, noon-metals react with acids.    ( )

Ans- 

    (b) Sodium is a very reactive metal.                  ( )

Ans- 

    (c) Copper displaces zinc from zinc sulphate solution. ( )

Ans-

    (d) Coal can be drawn into wires.                      ( )  

Ans-

5. Some properties are listed in the following Table. Distinguish between metals and non-metals on the  basis of these properties.

Properties

Metals

Non-Metals

1. Appearance

2. Hardness

3. Malleability

4. Ductility

5. Heat Conduction

6. Conduction of Electricity

 

 

6. Give reasons for the following:

    (a) Aluminium foils are used to wrap food items. 

Ans-

   (b) Immersion rods for heating liquids are made up of  metallic  substances.

Ans-

   (c) Copper cannot displace zinc from its salt solution.

Ans-

   (d) Sodium and potassium are stored in kerosene.

Ans-

7. Cam you store lemon pickle in an aluminium utensil? Explain.

Ans-

8. Match the substances given in Column A with their uses given in Column B.

A

B

(i)Gold

(ii)Iron

(iii)Aluminium

(iv)Carbon

(v)Copper

(vi)Mercury

(a)Thermometers

(b)Electric wire

(c)Wrapping food

(d)Jewellery

(e)Machinery

(f)Fuel


9. What happens when 
    (a) Dilute sulphuric acid is poured on a copper plate?
    Ans-
    (b) Iron nails are placed in copper sulphate solution?
    Ans-
10. Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.
    (a) How will she find the nature of the gas?
    Ans-
    (b) Write down word equations of all the reactions taking place in this process.
    Ans-
11. One day Reeta went to a jeweller's shop with her mother gave an old gold jewellery to the goldsmith to polish. Next day when brought the jewellery  back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight?
Ans-



Type- Ankur Moni Nath