Discussion
Assertion (A): Solvent extraction plants are built with stringent fire precautions.
Reason (R): Commercial hexane is highly flammable and its vapour forms explosive mixtures with air.
Select the correct answer from the options below.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the whole basis of the precautions. Commercial hexane has a flash point around minus 22 degrees Celsius and forms explosive mixtures with air over a wide range of concentrations.
Everything in the plant follows from that: electrical equipment is flameproof, the building is designed to vent an explosion, vapour is recovered rather than released, and hot work is tightly controlled. It is also why hexane loss per tonne is watched as a safety figure and not merely as a cost.
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