The solution used by goldsmith for cleaning tarnished jewellery is a mixture of two acids X and Y in the ratio 1 : 3, X and Y are:(A) Conc. H₂SO₄ and Conc. HCl (B) Conc. H₂SO₄ and Conc. HNO₃(C) Conc. HNO₃ and Conc. HCl (D) None of these
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(C) hno3 and HCl as it is only called aqua regia
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The correct answer is Option (C).
Here X = concentrated HNO3
and Y = concentrated HCl
This mixture is called Aqua Regia or Royal water in Latin. It is used to remove gold and other metal in micro electronics. Usually, gold does not reacts with acids, however Aqua Regia can dissolve gold. When gold is dipped in Aqua Regia, the outer layer is dissolved in Aqua Regia and the inner layer appears shining. This causes loss of weight in gold during polishing and hence reduction in weight.
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