Question

(4) Small amount of copper is added to gold and silver while making jewellery. Why?
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Answer 1

Answer:

this is because when gold melts its state will change into liquid.Gold will like water so it flows and it will become difficult to mould.so copper is added to gold which is there in liquid state ,so it will harden gold a little bit to prevent from flowing which will be easy to mould gold to make ornaments.

Answer 2

Answer:

Small amount of copper is added to gold and silver while making jewellery because gold is highly malleable substance . To avoid the breaking of jewellery and make it strong it is added.