Q. Pilling and Bed worth proposed that oxidation resistance is related to the volume ratio of oxide and metal per grams atom of metal.

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Q. 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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Q. Which of the following is/are the causes for the poor oxidation resistance of metal oxide with high Pilling and Bed worth ratio?

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Q. Which of the following is/are the ideal characteristics of the passive metal oxide layer?

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Q. Which of the following metal has a nonprotective oxide?

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Q. What is the value of the Pilling and Bed worth ratio of tungsten?

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Q. Which of the following is/are the interface at which new metallic oxides (MO) are produced?

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Q. The diffusion of either cation or oxygen ions usually controls the reaction rate of high-temperature metallic oxidation.

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Q. Which of the following order is correct regarding the oxides of iron starting from metallic iron to gaseous oxygen interface?

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Q. The relative thickness of each phase of a metallic oxide is determined by the rate of ionic diffusion through that phase.

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Q. Which of the following metal(s) produces metal oxide at a metal-scale interface?

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Q. Which of the following is/are the n-type semiconducting oxides?

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Q. Which of the following is/are the p-type semiconducting oxides?

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Q. In general, all oxides are nonstoichiometric in nature their composition varies from an ideal molecular formula.

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Q. Which of the following is/are correct regarding the measurement of the rate of oxidation?

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Q. Diffusion-controlled oxidation can be minimized by decreasing the concentration of ionic defects in the scale.

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Q. What are the types of oxidation rate laws?

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Q. Which of the following is/are correct regarding linear oxidation law?

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Q. Which of the following metal doesn’t follow linear oxidation law?

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Q. Which of the following is/are true regarding parabolic oxidation rate law?

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