2 mL each of Conc. HCl, HNO₃ and a mixture of conc. HCl, & conc. HNO₃, in the ratio of 3:1 were taken in test tubes labelled as A, B, and C. A small piece of metal was put in each test tube. No change occurred in test tubes A & B, but the metal got dissolved in test tube C. The metal could be:
A mixer of Conc. HCl & Conc. HNO₃ in the ratio of 3:1, is known as “Aqua-Regia”. Gold dissolve only in aqua-regia.
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[B] Au