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In pickling and etching _________ acids are used.(a) Sulphuric acid(b) Hypo chlorous acid(c) Phosphoric acid(d) Phosphorous acidThe question was posed to me in class test.My doubt stems from Protective Coatings topic in chapter Electro Chemical Cells and Corrosion of Applied Chemistry

Answer»

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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