Đáp án đúng: A AgNO3 và H2SO4 loãng. A. $Fe+2AgN{{O}_{3}}\xrightarrow{{}}Fe{{(N{{O}_{3}})}_{2}}+2\text{A}g$ $Fe+{{H}_{2}}S{{O}_{4\ }}_{lo\tilde{a}ng}\xrightarrow{{}}FeS{{O}_{4}}+{{H}_{2}}$ B. $\displaystyle Fe\text{ }+\text{ }2FeC{{l}_{3}}~\xrightarrow{{}}3FeC{{l}_{2}}$ C. $\displaystyle Fe\text{ }+\text{ }2HCl\xrightarrow{{}}FeC{{l}_{2}}+\text{ }{{H}_{2}}$ D. $\displaystyle Fe\text{ }+\text{ }CuS{{O}_{4}}\xrightarrow{{}}FeS{{O}_{4}}+\text{ }Cu$