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1.
When a metal reacts with nitric acid, no hydrogen gas is produced. However, the metal that produces hydrogen gas when it reacts with very dilute nitric acid is
2.
When metals react with HCl, hydrogen gas is produced; when they react with HNO_3, no hydrogen gas is produced. On the other hand, magnesium and manganese form hydrogen gas when they react with very dilute HNO_3. The metal that is dissolved by the combination of HNO_3 and HCl is