Q24 of 400 Page 131

What is meant by “brittleness” ? which type of elements usually show brittleness : metals or non-metals ?

Being brittle is the property of metals called brittleness. Non-metals are the elements which generally shows brittleness.

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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.

 23 Name one property which is characteristic of (a) metals, and (b) non-metals. 25 What will happen if a strip of zinc is kept immersed in a solution of copper sulphate ? 26 What will happen if a strip of copper is kept immersed in a solution of silver nitrate (AgNO3)?