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Which of the following is the most stable state of metal?

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Which of the following is the most stable state of metal?

(a) Ore of metal

(b) Pure metal

(c) Corroded metal

(d) Metal ion

The question was posed to me during an interview.

This interesting question is from Causes and Effects of Corrosion topic in section Corrosion, Electrolysis, Fuel Cells and Batteries of Engineering Chemistry II

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Right option is (a) Ore of metal

Explanation: Ore of metal is a thermodynamically most stable form of metal. It does not undergo any alteration in the form of ore without the use of any external force.

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