Discussion
Assertion (A): Ammonia is recycled in the Solvay process rather than consumed.
Reason (R): It is recovered from the filtrate by treatment with lime and returned to the ammoniation stage.
Answer: C
Both are true and the reason gives the mechanism: the ammonia acts as a carrier for carbon dioxide rather than as a reactant, which is what makes the economics of the process work. Lime from the same limestone recovers it.
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