Fill in the blanks :
1. ....................... element that has the highest melting point.
2. ....................... is the only non-metal in liquid state.
3. Chocolates are wrapped in an aluminium foil, this is an application of
property of ....................... .
4. PVC stands for....................... .
5. Metal oxides are usually ....................... in nature.
6. Aluminium oxide is ....................... in nature.
7. Metals react with water to form a metal hydroxide and ....................... gas
is liberated.
8. Metals react with dilute acids to give ....................... and .......................
gas is liberated.
9. Sodium is a ....................... coloured metal.
10. Chlorine is a ....................... .
11. The most unreactive metals i.e. which are not affected by air and water
e.g. silver, gold and platinum are generally found in ....................... state.
12. The symbol of Aluminium is ....................... .
13. The valency of aluminium is ....................... .
14. Aluminum undergoes an oxidation reaction forming a thin layer of
....................... .
15. Potassium is the ....................... metal.
16. Pure gold is ....................... gold.
17. Pure gold is alloyed with ....................... or ....................... to make ornaments.
18. Aqua regia can dissolve metals like....................... and ....................... .
A. Answers
1. Tungsten
2. Bromine
3. Malleability
4. Poly vinyl chloride
5. Basic
6. Amphoteric
7. Hydrogen
8. Salt and hydrogen gas
9. Silver
10. Non – metal
11. Free or native
12. Al
13. 3
14. Aluminium oxide
15. Most reactive
16. 24 karat
17. Silver or copper
18. Gold and platinum
