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What is the catalyst used in the industrial manufacture of nitric acid?

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What is the catalyst used in the industrial manufacture of nitric acid?

(a) Powdered iron (III) oxide

(b) Vanadium (V) oxide

(c) Zinc-mercury amalgam

(d) Platinum-Rhodium gauze sheet

The question was posed to me during an interview for a job.

I need to ask this question from P-Block Elements topic in portion P-Block Elements of Chemistry – Class 12

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The correct option is (d) Platinum-Rhodium gauze sheet

For explanation I would say: Pt-Rh gauze sheet is widely used as the catalyst in ammonic oxidation, the first step of Ostwald’s process. Fe2O3 is used in Haber’s process; V2O5 in contact process and Zn (Hg) is used in Clemmensen reduction of aldehydes.

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