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What is the purpose of coating iron with a thin layer of zinc?
A. To make it stronger.
B. To make is easier to polish.
C. To prevent its corrosion.
D. To increase its electrical conductivity​

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Answer:

Letter D

Explanation:

Galvanising is a method of rust prevention. The iron or steel object is coated in a thin layer of zinc. This stops oxygen and water reaching the metal underneath - but the zinc also acts as a sacrificial metal . Zinc is more reactive than iron, so it oxidises in preference to the iron object.

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