The main purpose of galvanising iron sheets is to___________________?
Correct answer: B. Prevent the action of water
- A. Harden the surface
- B. Prevent the action of water
- C. Increase its glossiness and lustre
- D. Prevent the action of oxygen
Explanation
Galvanising coats iron with zinc, isolating it from moisture and forming a sacrificial protective layer. Water is essential for ordinary rusting, so preventing its contact is the best choice; oxygen alone does not rust dry iron.
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