Q23 of 400 Page 131

Name one property which is characteristic of (a) metals, and (b) non-metals.

The one property which is the characteristic of metal is malleability. And the one property of non-metal is non-malleability.

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21 Which metal foil is used for packing some of the medicine tablets ? 22 Name the non-metal which is used:

(a) to convert vegetable oil into vegetable ghee (solid fat).


(b) as a rocket fuel (in liquid form).


(c) to make electrodes of dry cells.


(d) to preserve food materials.


(e) in the valcanisation of rubber.

 24 What is meant by “brittleness” ? which type of elements usually show brittleness : metals or non-metals ? 25 What will happen if a strip of zinc is kept immersed in a solution of copper sulphate ?