What is the composition of aqua-regia?
- A$1 : 3$ conc. $HNO_3$ and conc. $HCl$
- B$1 : 2$ conc. $HNO_3$ and conc. $HCl$
- C$3 : 1$ conc. $HNO_3$ and conc. $HCl$
- D$2 : 1$ conc. $HNO_3$ and conc. $HCl$
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