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Which of the following concentration of sulfuric acid in which the corrosion rate of steel is minimum?

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Which of the following concentration of sulfuric acid in which the corrosion rate of steel is minimum?

(a) Less than 30%

(b) Greater than 70%

(c) 30% – 70%

(d) above 110%

I have been asked this question in a job interview.

The origin of the question is Mineral Acids topic in chapter Mineral Acids of Corrosion Engineering

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Correct choice is (b) Greater than 70%

To explain: Ordinary steels are widely used for various concentrations of sulfuric acid greater than 70% purity. Dilute acids attack steel very rapidly and result in faster degradation.

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