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Which of the following is/are the impurities that cause corrosion in commercial phosphoric acid?

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Which of the following is/are the impurities that cause corrosion in commercial phosphoric acid?

(a) Fluorides

(b) Chlorides

(c) Sulfuric acids

(d) Fluorides, chlorides and sulfuric acid

The question was asked in a job interview.

I would like to ask this question from Mineral Acids in section Mineral Acids of Corrosion Engineering

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Right option is (d) Fluorides, chlorides and sulfuric acid

Easiest explanation: Corrosion by phosphoric acid depends on the methods of manufacturing and impurities present in that commercial acid. Impurities that are usually present in commercial phosphoric acid are fluorides, chlorides, and sulfuric acid.

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