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The phenomenon during which the boiler material becomes brittle due to accumulation of caustic substances is known as ___________

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The phenomenon during which the boiler material becomes brittle due to accumulation of caustic substances is known as ___________

(a) Foaming

(b) Priming

(c) Corrosion

(d) Caustic embrittlement

I got this question in an internship interview.

Origin of the question is Boiler Feed Water in chapter Water and its Treatment of Engineering Chemistry II

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Right option is (d) Caustic embrittlement

Explanation: The phenomenon during which the boiler material becomes brittle due to accumulation of caustic substances is known as caustic embrittlement. This can be prevented by using sodium phosphate instead of sodium carbonate as softening reagents.

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