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Which of the following is/are the examples of scavengers?

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Which of the following is/are the examples of scavengers?

(a) Arsenic and Antimony

(b) Chromates and ferric salts

(c) Sodium sulfite and hydrazine

(d) Organic amines

I had been asked this question in a job interview.

The question is from Corrosion Prevention topic in chapter Corrosion Prevention of Corrosion Engineering

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Correct choice is (c) Sodium sulfite and hydrazine

Explanation: Scavengers are the type of inhibitors that removes corrosive reagents from the solution. Sodium sulfite and hydrazine are examples of scavengers. 2Na2SO3+O2==>2Na2SO4 is the scavenging action of sodium sulfite.

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