What happen when?
Aqua-regia is added to gold.

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Solution

Gold dissolves in aqua regia to form chloroauric acid.
$3 \times [H N O_{3} + 3 H C l \to N O C l + 2 H_{2} O + 2 [C l]]$
$2 \times [A u + 3 [C l] \to A u C l_{3}]$
$2 \times [A u C l_{3} + H C l \to H [A u C l_{4}]]$
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$3 H N O_{3} + 2 A u + 11 H C l \to 3 N O C l + 6 H_{2} O + 2 H [A u C l_{4}]$

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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?

H g C l_{2}

H g C l_{2}

Gold does not react easily with acid but it reacts with aqua regia. What is aqua regia ? Why does it react with gold?

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