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Which of the following is an example of corrosion?

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Which of the following is an example of corrosion?

(a) Rusting of iron

(b) Tarnishing of silver

(c) Liquefaction of ammonia

(d) Rusting of iron and tarnishing of silver

I got this question during an online exam.

The above asked question is from Causes and Effects of Corrosion in portion Corrosion, Electrolysis, Fuel Cells and Batteries of Engineering Chemistry II

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Right option is (d) Rusting of iron and tarnishing of silver

Easiest explanation: Rusting of iron and tarnishing of silver are examples of corrosion which is caused by the oxidation process.

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