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Which by-product acids are used in the production of bromine from seawater?

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Which by-product acids are used in the production of bromine from seawater?

(a) HCl and H2SO4

(b) HCl and HNO3

(c) HCl and H2PO3

(d) Only HCl

I had been asked this question in an interview for job.

I'm obligated to ask this question of Chemical From Sea topic in division Inorganic Chemical Industries of Chemical Technology

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Correct answer is (a) HCl and H2SO4

To explain: By-product acids HCl and H2SO4 are used in bromine production in order to acidify the incoming seawater. Bromine reacts with SO2 and water and gives H2SO4 and HBr.

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