Question: A solid sample is expected to consist of a mixture of FeS,Fe3O4 and CaCO3. (i) Explain briefly the surface analytical techniques to determine the crystal

A solid sample is expected to consist of a mixture of FeS,Fe3O4 and CaCO3. (i) Explain briefly the surface analytical techniques to determine the crystal structure of each compound in the sample. (ii) If the analysis is required to determine quantitatively the chemical composition on the surface of the sample, explain briefly what are the surface analytical techniques that are required to accomplish the analysis? (iii) If the analysis is required to determine the ratio of Fe2+ and Fe3+ in the sample, explain briefly what are the surface analytical techniques that is required to accomplish the analysis

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