According to API RP 571, under Sulfuric Acid Corrosion:
“The most aggressive corrosion typically occurs below 65% H₂SO₄, particularly between 20% to 50% concentration range.”
“Above 95% concentration, sulfuric acid becomes less corrosive to carbon steel due to its dehydrating nature.”
“Dilute sulfuric acid is highly ionized and conducts electricity well, increasing corrosion rates.”
(Reference: API RP 571, Section 4.3.3.2 – Sulfuric Acid Corrosion)
Hence, the most severe corrosion occurs below 65% concentration, making option B the accurate answer.
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