The composition of aqua-regia is
- A$\text{Dil. HCl} : \text{Conc. HNO}_3 = 3:1$
- B$\text{Conc. HCl} : \text{Dil. HNO}_3 = 3:1$
- C$\text{Dil. HCl} : \text{Dil. HNO}_3 = 3:1$
- D$\text{Conc. HCl} : \text{Conc. HNO}_3 = 3:1$
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