Multiple choice

Why is zinc-coated iron used in bridges?

  1. Zinc gives shiny appearance to iron.

  2. Zinc increases the strength of the structure.

  3. Zinc reacts with iron to produce an alloy which is less affected by temperature change, thereby preventing the structure from developing cracks.

  4. Zinc protects iron from rusting.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Zinc protects iron from rusting.

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