Available Answers

1. 1.

   Give the common name & chemical name of an ore of-

   a) zinc
   b) aluminium
   c) iron

2. 2.

   Distinguish between the physical properties of metals & non-metals with reference to-a)lustre b)malleability c)ductility d) tensile strength e)sonority f)conduction of heat & electricity g)melting & boiling point h)density

3. 3.

   With reference to the physical properties of metals & non metals, state the following exceptions,

   1. a metal which is liquid at room temperature
   2. a non-metal which sublimes & is non-lustrous
   3. a non-metal which has low tensile strength
   4. a non-metal which conducts electricity
   5. a metal which floats on water.
4. 4.

   With reference to the following metals state their-use in daily life.

   Metals:

   1. copper
   2. iron
   3. aluminium
   4. magnesium
   5. zinc
   6. lead
   7. silver
5. 5.

   Describe a simple experiment to prove that - a copper wire conducts electricity, but a piece of coal does not.

6. 6.

   Differentiate between metals & non-metals with reference to -

   1. number of electrons in outer or valence shell
   2. formation of cation & anion
   3. reaction with dilute acids