Discussion
Assertion (A): Flue gas is not usually cooled below about one hundred and fifty degrees Celsius in a conventional boiler.
Reason (R): Sulphuric acid condenses below the acid dew point and attacks the metal.
Answer: A
Both are true and the reason gives the constraint: recovering that last heat requires corrosion resistant materials, which is exactly what a condensing boiler provides. Stainless steel or plastic flues are used in those units.
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