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In pickling and etching _________ acids are used.

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In pickling and etching _________ acids are used.

(a) Sulphuric acid

(b) Hypo chlorous acid

(c) Phosphoric acid

(d) Phosphorous acid
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Right choice is (a) Sulphuric acid

For explanation: In pickling and etching process, the acids used are hydrochloric acid, sulphuric acid and nitric acid.
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