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Which of the following impurity in hydrochloric acid results in pitting corrosion?

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Which of the following impurity in hydrochloric acid results in pitting corrosion?

(a) Ferrous chloride

(b) Ferric chloride

(c) Potassium chloride

(d) Sodium chloride

This question was addressed to me during an interview for a job.

The query is from Mineral Acids topic in section Mineral Acids of Corrosion Engineering

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Correct option is (b) Ferric chloride

The explanation: Ferric chloride in small amounts is more destructive than oxygen in hydrochloric acid. It initiates pits and results in pitting corrosion on various metals in the hydrochloric environment.

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