SOLUTIONS OF WORKSHEET 1 (MATERIALS: METALS AND NON METALS, CLASS 8, CH 4)

 1. Soln:

Answer is (b) Sulphur

2. Soln:

Answer is (d) zinc granule

Explanation:

Metals can be beaten into thin sheets whereas non-metals break into pieces on hitting hence answer is (d) zinc granule.

3. Soln:

Answer is (d) Piece of coal

Explanation:

Iron, Copper and aluminium are metals whereas coal is a non-metal hence answer is (d) piece of coal.

4. Soln:

Answer is (c) sulphur

Explanation:

Ductility is the property of metals. Here Sulphur is non-metal which is not have ductile property.

5. Soln:

Answer is (b) Sodium

Explanation:

Sodium is highly reactive metals which looks soft and can be cut into pieces by using a knife.

6. Soln:

Answer is (a) Mercury

7. Soln:

Answer is (d) Copper

Explanation:

Less reactive metals like Copper, gold and silver does not react with dilute HCl to produce Hydrogen gas.

8. Soln:

Answer is (b) Sodium

Explanation:

Sodium reacts vigorously with water, hence it is stored in kerosene to avoid reaction of sodium with moisture in the atmosphere and oxygen.

9. Soln:

Answer is (c) Aluminium

Explanation:

Aluminium reacts with dilute HCl as well as NaOH to produce Hydrogen Gas.

10. Soln:

Answer is (a) Phosphorus

11. Soln:

Answer is (a) Sulphur dioxide

Explanation:

Sulphur forms Sulphur-di-oxide which is acidic in nature and it will convert blue litmus to red.

12. Soln:

Answer is (b) Colour.

13. Soln:

(i) Sodium (ii) Potassium

14. Soln:

Oxygen.

15. Soln:

(i)Nitrogen (ii) Phosphorus

16. Soln:

Chlorine.

17. Soln:

Iodine.

18. Soln:

There will be no change as displacement reaction will not take place.

19. Soln:

Metals show the sonorous property, hence they are used in making bells.

20. Soln:

Mercury.

21. Soln:

Zinc.

22. Soln:

The green coating on the copper statue is the mixture of CU(OH)2 and CUCO3 which are formed due to reaction of moisture and copper.

23. a) Iron is a metal.

b) Metals are good conductors of electricity.

24. Soln:

If the iron nail is replaced by a wooden stick bulb will not glow as wood is a bad conductor of electricity.

25. Soln:

In beaker A, a reddish-brown layer of copper will deposit on the iron nail and the blue coloured solution will become yellowish-green. On the other hand, no change is observed in beaker B.