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B
HCl
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C
H2SO4
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D
HNO2
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Solution
The correct option is CH2SO4 Pickling is a metal surface treatment i.e; used to remove impurities such as strains, inorganic contaminants on the surface of the metal. So to remove this pickling liquor containing acid is used.
H2SO4 is used as pickling agent because of its high oxidizing power, for which it can dissolve noble metals as well.