What happen when?
Gold is dissolved in aqus-regia.

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Solution

When gold is dissolved in aqua regia, it forms chloroauric acid ( $H A u C l_{4}$ ). The chemical reaction shows gold reacting with both components of aqua regia: nitric acid ( $H N O_{3}$ ) and hydrochloric acid ( $H C l$ ).

In this reaction gold is oxidised.

$A u + 3 H N O_{3} + 4 H C l ⟶ 2 H A u C l_{4} + 3 N O_{2} + 3 H_{2} O$

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Similar questions

(i) What is aqua-regia?
(ii) State the use of aqua-regia.
(iii) What is the function of HCl in preparation of aqua-regia?

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