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Corrosion in boilers can be prevented by | |
A. | deaeration of feed water. [Wrong Answer] |
B. | enhancing pH of feed water by adding alkali. [Wrong Answer] |
C. | feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion. [Wrong Answer] |
D. | all (a), (b) and (c). [Correct Answer] |