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Which of the following is used as reducing agent in electric furnace process (direct conversion at plant site)?

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Which of the following is used as reducing agent in electric furnace process (direct conversion at plant site)?

(a) Coke

(b) Graphite

(c) Nascent hydrogen

(d) Sodium amalgam

This question was posed to me in an internship interview.

My doubt stems from Inorganic Chemical topic in division Inorganic Chemical Industries of Chemical Technology

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Right answer is (a) Coke

Easiest explanation: Coke is used as reducing agent for reducing phosphorous present in calcium phosphate Ca3 (PO4)2  into elemental phosphorous P4.

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