Question

Which of the following is an amphoteric metal?

• A. Calcium
• B. Iron
• C. Aluminium
• D. None of these

Answer 1

The correct option is C

Aluminium

Part-1 Explanations for the correct answer

Correct option- (C) Aluminium (Al)

• The element which can react with both acid and base is amphoteric in nature.
• And aluminum can react with both acid and base that's it is amphoteric in nature.

$$\begin{gathered} 2\mathrm{Al}\left(s\right)+2\mathrm{NaOH}\left(aq\right)+2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)\stackrel{\Delta }{⟶}2{\mathrm{NaAlO}}_2\left(aq\right)+3{\mathrm{H}}_2\left(\mathrm{g}\right) \\ \mathrm{Aluminium}\mathrm{Sodium}\mathrm{hydroxide}\mathrm{Water}\mathrm{Sodium}\mathrm{meta}\mathrm{aluminate}\mathrm{Hydrogen} \end{gathered}$$

$$\begin{gathered} 2\mathrm{Al}\left(s\right)+6\mathrm{HCl}\left(aq\right)⟶2{\mathrm{AlCl}}_3\left(aq\right)+3{\mathrm{H}}_2\left(\mathrm{g}\right) \\ \mathrm{Aluminium}\mathrm{Hydrochloric}\mathrm{acid}\mathrm{Aluminium}\mathrm{chloride}\mathrm{Hydrogen} \end{gathered}$$

Part-2 Explanation for the incorrect answer

Incorrect option - (A) Calcium (Ca)

• Ca is alkaline in nature.
• It can only react with acid.

Incorrect option - (B) Iron (Fe)

• Fe is acidic in nature.
• It can only react with the base

Incorrect option - (D) None of these

This option is invalid.

Final Answer- Hence, the correct option is (C) Aluminum is an amphoteric metal.