Question

15. Generally, a metal gets corroded due to oxidation. Name a metal which becomes chemically resistant due to oxidation.

• A. zinc
• B. copper
• C. aluminium
• D. iron

Answer 1

The correct option is C

aluminium

Explanation:

• Generally, a metal gets corroded due to oxidation.
• Aluminum $\left(\mathrm{Al}\right)$ has a very high affinity toward oxygen.
• When an aluminum surface is exposed in the presence of air or any other oxidizing agent, it quickly develops a thin, hard film of Aluminum oxide$\left({\mathrm{Al}}_2{\mathrm{O}}_3\right)$.
• This Aluminum oxide surface now stops further oxidation of aluminum, hence stopping it from corroding further.
• Thus, making it chemically resistant to oxidation.

Hence the correct answer is (C)