The correct answer is: Gold.
Nitric acid is a strong oxidizing agent and will react with most metals to produce a salt and hydrogen gas. However, gold is a noble metal and is not easily oxidized. In fact, nitric acid will not react with gold at all.
Copper, zinc, and iron are all metals that will react with nitric acid. Copper will produce copper nitrate, zinc will produce zinc nitrate, and iron will produce iron nitrate. In addition, all three metals will produce hydrogen gas.
Here is a more detailed explanation of each option:
- Gold is a noble metal and is not easily oxidized. In fact, nitric acid will not react with gold at all.
- Copper is a metal that will react with nitric acid to produce copper nitrate and hydrogen gas.
- Zinc is a metal that will react with nitric acid to produce zinc nitrate and hydrogen gas.
- Iron is a metal that will react with nitric acid to produce iron nitrate and hydrogen gas.