Metals and Non-Metals Worksheet-3

Metals and Non-Metals Worksheet-3

1. Identify which among the following is a property of non metal:

(a) Low densities

(b) Low melting points

(c) Poor conductor of electricity

(d) All the three

2. Identify the metal among the following options which does not react with HCl:

(a) Ag                 (b) Mg                (c) Al                   (d) Fe

3. A crucible is used in lab to heat solids at high temperature. Identify the material with which it is made of:

(a) Sulphur       (b) Silicon          (c) Graphite      (d) Phosphorus

4. Al₂O₃ is chemical formula of which ore?

(a) Cryolite        (b) Corundum  (c) Kaolin          (d) Bauxite

5. Metals form compounds with oxygen that are:

(i)   acidic in nature

(ii)  basic in nature

(iii) Neutral in nature

(iv) Amphoteric in nature

(a) i or iii            (b) ii or iv           (c) i only             (d) ii only

6. Formation of green layer on the surface of copper utensils is due to:

(a) Corrosion    (b) Oxidation    (c) Reduction    (d) none of these

7. The metal whose stable ion has duplet configuration is:

(a) Lithium       (b) Sodium        (c) Magnesium (d) Calcium

8. The metals have a tendency to show variable valency. The metal that shows variable valency is:

(a) Iron              (b) Copper         (c) Manganese (d) All of these

9. A scientist takes a burning substance and collects the evolved vapours in a gas jar and makes sure that they do not escape. A small amount of water is added to the test tube. To the solution obtained, a few drops of red litmus solution are added. The litmus solution turns blue. Which of the following could be the burning substance?

(a) Mg                                             (b) S

(c) Both Mg and S                        (d) None of these

10. An electrician always uses a screw driver having a wooden or plastic handle. Why?

(a) Wood and plastic are poor conductors of electricity

(b) Wood and plastic are good conductors of electricity

(c) Wood alone is a poor conductor of electricity and not plastic

(d) Plastic alone is a poor conductor of electricity and not wood

11. Read the following statements carefully and identify the elements  X, Y and Z respectively.

(i) X reacts violently with cold water.

(ii) Y reacts with boiling water.

(iii) Z reacts with steam.

(a) Na, Mg, Cu                              (b) Na, Zn, Fe

(c) Cu, Zn, Na                               (d) Zn, Cu, Na

12. Phosphorus is a non metal with atomic number 15.Care must be taken while storing phosphorus. It is stored in water, because

(a) Phosphorus is a very reactive non-metal

(b) It catches fire when exposed to air

(c) Both Phosphorus is a very reactive non-metal & It catches fire when exposed to air

(d) None of these.

13. Metals can be hammered into thin sheets. This property is called:

(a) Density                                     (b) Malleability

(c) Ductility                                   (d) Strength

14. The nonmetal used to treat rubber in the process of vulcanisaction is:

(a) Sulphur                                    (b) Phosphorus

(c) Carbon                                      (d) Chloride

15. Metals like aluminium and iron etc. can be hammered into thin sheets. This property is called:

(a) Density                                     (b) Malleability

(c) Ductility                                   (d) Strength

Answer Key:

(1)-(d); (2)-(a); (3)-(c); (4)-(b); (5)-(b); (6)-(a); (7)-(a); (8)-(d); (9)-(a); (10)-(a); (11)-(b); (12)-(c); (13)-(b); (14)-(a); (15)-(b)