Noble metals,like gold and platinum,are soluble in which of the following mixtures?
- A$1:1$ mixture of conc. $HNO_3$ and conc. $H_2SO_4$
- B$1:3$ mixture of conc. $HCl$ and conc. $HNO_3$
- C$1:3$ mixture of conc. $HNO_3$ and conc. $HCl$
- D$1:3$ mixture of conc. $H_2SO_4$ and conc. $HCl$
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