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Aqua-regia can dissolve noble metals. Ex...

Aqua-regia can dissolve noble metals. Explain.

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`1:3` mixture of conc. `HNO_(3)` and conc. `HCl` is Aquaregia.The mixture produces nascent chlorine, which reacts with noble metals to dissolve them
`HNO_(3)+3HCl rarr 2H_(2)O+2(Cl)+NOCl`
`Au+3(Cl)rarrAuCl_(3),AuCl_(3)+HC l rarr underset("(chloroauric acid)")(HAuCl_(4))`
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