Q
14.
Which of the following is not a method for preventing rusting of iron?
1. painting 2. alloying 3. galvanising 4. watering
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Answer:
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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➼ Answer ➼
》 (4) Watering is not a method to prevent the rusting of iron,
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