Discussion
Assertion (A): Multiple effect evaporation is universal in sugar manufacture.
Reason (R): The vapour from each body serves as the heating medium for the next, so one kilogram of steam evaporates several of water.
Answer: C
Both are true and the reason gives the economy: with five effects roughly five kilograms of water leave per kilogram of live steam, which transforms the energy balance of the factory. Boiling point rise limits how many effects are worth having.
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