4. Precious ornaments are made from gold or platinum and not from copper.
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Platinum, gold and silver are used to make jewellery because the metals used in jewellery are always be chosen on the basis of its reactivity. It should be unreactive so that the metal does not tarnish.
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platinum , gold and silver are used to make jewellery because these are low reactive metals so rarely corrosion occur ( In silver) and hence do not lost their shine and lustre
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