Give reasons (a) Platinum, gold and silver are used to make jewellery. (b) Sodium, potassium and lithium are stored under oil. (c) Aluminium is a highly reactive metal, yet it is used to make utensils for cooking. (d) Carbonate and sulphide ores are usually converted into oxides during the process of extraction
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(a) Platinum, gold and silver are used to make jewellery because they are the least reactive among other elements as per the metal reactivity series.
(b)Sodium, Potassium and lithium are stored under oil because they react vigorously with the oxygen present in the air.
(c) Aluminium is used for cooking though it is reactive because when it reacts with oxygen in the atmosphere, it forms an oxide layer which prevents it from further corrosion and hence makes it stronger.
(d) Extraction can only be done from oxides (easily), that is why carbonates ans sulphide ores are usually converted into oxies for extraction.
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