Fewpal
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We spend crore of Rupees and even thousands of lives every year due to corrosion. How can it be prevented? Explain.

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By Galvanization: Coating of a less reactive metal with a more reactive metal e.g. coating of iron surface with Zn to prevent rusting of iron.  

By greasing/oiling (to keep away the object from the contact of air & moisture.)  

By painting (to keep away the object from the contact of air &moisture.)

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