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Which of the following inhibitor has been effective for internal corrosion domestic fuel oil tanks?

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Which of the following inhibitor has been effective for internal corrosion domestic fuel oil tanks?

(a) Alkaline sodium chromate

(b) Sodium silicate

(c) Ammonia

(d) Sodium carbonate

This question was posed to me in an online interview.

The origin of the question is Environments topic in chapter Other Environments of Corrosion Engineering

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Correct option is (a) Alkaline sodium chromate

For explanation I would say: Alkaline sodium chromate or sodium nitrate is an effective inhibitor for the corrosion of domestic fuel oil tanks. The chemical formula of sodium chromate is Na2CrO4.

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