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Which of the following is raw material used in manufacture of graphite is burned out and requires replacement?

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Which of the following is raw material used in manufacture of graphite is burned out and requires replacement?

(a) Graphitized grade coke

(b) Saw dust

(c) Furnacing sand

(d) Pitch binder

The question was asked by my school teacher while I was bunking the class.

This intriguing question originated from Inorganic Chemical topic in section Inorganic Chemical Industries of Chemical Technology

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Best answer
Correct option is (b) Saw dust

Best explanation: Furnacing acid is repeatedly used for covering the reactants whereas saw dust used for final insulation cover is burned out and replacement is required.

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