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What is aqua-regia ? How it works to dissolve noble metals ? |
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Answer» Solution :Aqua-regia is `3:1` mixture of CONC. `HNO_(3)` and conc. HCL. The mixture contains NASCENT chlorine produced due to reductionof HCl by `HNO_(3)`. This chlorine reacts with noble metals to dissolve them. `HNO_(3)+3HCl to 2H_(2)O+2Cl+NOCl` `Au+3Cl to AuCl_(3)` `AuCl_(3)+HCl to HAuCl_(4)` (chloroauric acid) |
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