explain how does aqua regia dissolves gold and platinum??

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Solution

Aqua regia is a very strong acid and consist of niric acid and hydrochloric acid in the ratio of 1:3. It dissolves gold and Platinum by forming Gold chloride and chloroplatinate ion as shown below:
Au (s) + 3NO₃^-(aq) + 6H⁺(aq) + 4Cl^-(aq) â†’ AuCl₄^- (aq) + 3NO₂ (g) + 3H₂O (l)
Pt (s) + 4NO₃^-(aq) + 8H⁺(aq) + 6Cl^-(aq) â†’ PtCl₆^-2 (aq) + 4NO₂ (g) + 4H₂O (l)

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