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Which of the following is/are the characteristics of a metal oxide if the Pilling and Bed worth ratio is less than 1?

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Which of the following is/are the characteristics of a metal oxide if the Pilling and Bed worth ratio is less than 1?

(a) Protective

(b) Unprotective

(c) Unprotective and insufficient oxide

(d) Unprotective and sufficient oxide

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This key question is from High-Temperature Corrosion topic in section High Temperature Corrosion of Corrosion Engineering

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The correct option is (c) Unprotective and insufficient oxide

For explanation: If Pilling and Bed worth ratio of a metal oxide is less than 1 then it is an unprotective and insufficient oxide, if it is near to 1 then it is protective and adherent and if it is greater than 1 then it is unprotective.

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