Multiple choice

During galavanisation, which substance is coated on the surface of iron to protect it from rusting?

  1. Zinc

  2. Tin

  3. Aluminium

  4. Gallium
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A Correct answer
Explanation

Galvanization is the process of applying a protective zinc coating to iron or steel to prevent rusting. Zinc acts as a sacrificial anode, corroding preferentially to protect the underlying metal even if the coating is scratched. Tin and aluminium provide barrier protection only, while gallium is not used for galvanization.

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