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_______ is used for removing scales during the manufacture of tinplate.

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_______ is used for removing scales during the manufacture of tinplate.

(a) Lithium hydride

(b) Hydroboric acid

(c) Orthophosphoric acid

(d) Hydrochloric acid

The question was asked in exam.

This interesting question is from Manufacture of Tinplate topic in chapter Metal Packaging Materials of Food Packaging Technology

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Correct choice is (d) Hydrochloric acid

To elaborate: The scale is removed by a process called “pickling,” which uses a dilute aqueous solution of acid (traditionally sulfuric acid but now mainly hydrochloric acid) near its boiling point. After pickling, the oxide-free strip is recoiled and coated with an oil to prevent rust formation and act as a lubricant in subsequent operations.

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