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Which promoter mentioned below is used in the contact process?

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Which promoter mentioned below is used in the contact process?

(a) Iron

(b) Alkali

(c) Acid

(d) Air

I had been asked this question by my college professor while I was bunking the class.

The query is from Inorganic Chemical in chapter Inorganic Chemical Industries of Chemical Technology

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Correct answer is (b) Alkali

Easy explanation: In contact process alkali is used as promoter in trace amounts to enhance activity of catalytic agent in order to decrease the reaction time for better economy.

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