a) One day Seema went to a jeweller's shop with her mother. Her mother gave an old gold jewellery to the
gold smith to polish. Next day when they brought the jewellery back, they found there was a slight loss in its
weight. Can you suggest the reason for the loss in the weight?
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Answer:
because the gold can be react with air therefore the oxides are formed and moves into air
hence , the weight of jewellery lossed
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