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How many rust will be formed when 100kg of iron have completely rusted away?

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How many rust will be formed when 100kg of iron have completely rusted away?

(a) 100 kg

(b) 190 kg

(c) 250 kg

(d) 320 kg

This question was posed to me in unit test.

Question is taken from Causes and Effects of Corrosion topic in portion Corrosion, Electrolysis, Fuel Cells and Batteries of Engineering Chemistry II

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Best answer
Right option is (b) 190 kg

To explain: 190 kg of rust will be formed when 100kg of iron have completely rusted away.

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