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In nitric acid concentration by H2SO4 which equipment is used for concentrating purpose?

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In nitric acid concentration by H2SO4 which equipment is used for concentrating purpose?

(a) Stoneware towers

(b) Dehydrating tray towers

(c) cooling towers

(d) Chilling towers

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This key question is from Inorganic Chemical topic in chapter Inorganic Chemical Industries of Chemical Technology

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Correct option is (a) Stoneware towers

Explanation: In concentration by H2SO4 process, rectification by 93% can be obtain in silicon-iron or stoneware towers produces concentrated nitric acid and 75% concentrated H2SO4 which can be re-evaporated to 93%.

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