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1-Platinum, gold and silver are used to make jewellery because of their bright shiny surface and high resistance to corrosion. Also they have high malleability and ductility.
2-Oxides of metals which have both acidic as well as basic behaviour are known as amphoteric oxides. Such metallic oxides react with acids as well as base to produce salt and water. Examples of Amphoteric oxides are aluminium oxide and zinc oxide.
3-During electrolytic refining of a metal, impure metal is made anode and a thin strip of pure metal M is made cathode and the electrolyte used is the soluble salt of Metal M which is to be refined.
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i platinum gold silver used to make jewellery because they are non reactive metal which do not harm our body.
ii those ions or compounds which acts as both acid and bases is called as amphoteric compounds or amphoteric oxides. ex. aluminium oxides , zinc oxide.
Roasting is a strong heating process in the presence of abundant amount of air(oxygen).
Calcination is the strong heating process in the presence of limited amount of air ( oxygen).