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Metals does not exist in nature in the form of ___________

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Metals does not exist in nature in the form of ___________

(a) Nitrates

(b) Sulphates

(c) Carbonates

(d) Oxides

This question was addressed to me by my school teacher while I was bunking the class.

This is a very interesting question from Causes and Effects of Corrosion in division Corrosion, Electrolysis, Fuel Cells and Batteries of Engineering Chemistry II

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Correct choice is (a) Nitrates

To elaborate: Metals exist in nature in the form of oxides, sulphides, sulphates and carbonates.

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