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Which of the mentioned is a major problem for production of acetylene from Calcium carbide?

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Which of the mentioned is a major problem for production of acetylene from Calcium carbide?

(a) Choice of lime

(b) Waste disposal of lime residue

(c) Temperature and pressure control in generators

(d) All of the mentioned

I had been asked this question in final exam.

My query is from Inorganic Chemical topic in chapter Inorganic Chemical Industries of Chemical Technology

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Right choice is (d) All of the mentioned

Easy explanation: The major engineering problems encountered during production of acetylene from calcium carbide are Choice of lime, Avoidance of contact of CaC2 with moisture while storage and grinding, Temperature and pressure control in the generators, Waste disposal of lime residue from generator.

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