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AP EAMCET20226 Jul 2022Evening ShiftChemistrySolid StateActual

Which of the following molecular formula and type of defect are correct for the following statement? "In FeO crystal, some Fe ²⁺ ions are missing and the loss of positive charge is made up by the presence of Fe ³⁺ ions".

Options

  1. AFe _ 0.95 O and metal excess defect.
  2. BFe _ 1.05 O and metal deficiency defect.
  3. CFe _ 0.95 O and metal deficiency defect.
  4. DFe _ 1.05 O and metal excess defect.

Correct answer

C. Fe _ 0.95 O and metal deficiency defect.

Step-by-step solution

The crystal of FeO shows metal deficiency defect because some Fe ²⁺ ions go missing from their position in lattice and the loss of positive charge is made up by the presence of required number of Fe ³⁺ ions. Usually around 15 % Fe ²⁺ ions are found missing, therefore, the formula of oxide of iron is Fe _ 0.95 O .

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