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Which of the following is/are the impurities in commercial hydrofluoric acid that decreases corrosion of steel?

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Which of the following is/are the impurities in commercial hydrofluoric acid that decreases corrosion of steel?

(a) Sulfuric acid

(b) Fluosilicic acid

(c) Neither sulfuric acid nor fluosilicic acid

(d) Both sulfuric acid and fluosilicic acid

I had been asked this question in quiz.

My query is from Mineral Acids in division Mineral Acids of Corrosion Engineering

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Right answer is (d) Both sulfuric acid and fluosilicic acid

To explain: Usually impurities such as sulphuric acid and fluosilicic acid are present in commercial hydrofluoric acid that reduces the corrosion of steel.

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