alleryA metal dissolves only in a 3:1 mixture of concentrated HCl and HNO₃ (aqua regia), not in either acid alone. The metal is
Agold
Bcopper
Ciron
Dzinc
Answer & Solution
Correct answer: A. gold
Gold is unreactive to single acids but dissolves in aqua regia (3 HCl : 1 HNO₃), which is why aqua regia is famous for dissolving noble metals.
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