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(a)oxygen?12. Give reasonsPlatinum, gold and silver areused to make jewellery.Sodium, potassium andlithium are stored under oil.Aluminium is a highly reactivemetal, yet it is used to makeutensils for cooking.Carbonate and sulphide oresare usually converted intooxides during the process ofextraction.​

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ANSWER:

  1. platinum GOLD and silver used MAKING JEWELLERY because these METAL cannot react with moisture and oxygen .
  2. sodium and potassium stored under soil because in open it catches fire immidiately


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