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Which residue of petroleum refinery process is used as electrodes?

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Which residue of petroleum refinery process is used as electrodes?

(a) Petroleum coke

(b) Ammonia

(c) Wax

(d) Fuel oil

The question was posed to me in an international level competition.

Query is from Natural Products topic in section Natural Products of Chemical Technology

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Correct option is (a) Petroleum coke

The explanation is: Petroleum coke, one of the residues of petroleum refinery process is used in electrodes and also used for aluminium plants. Fuel oil is a residue, Wax is a heavy distillate, and Ammonia is a by-product.

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