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AP EAMCET201823 Apr 2018Evening ShiftChemistrySolid StateActual

A metal oxide crystallises in a hexagonal close-packed array of oxide ions with two out of every three octahedral holes occupied by metal ions. The formula of metal oxide is

Options

  1. AM O
  2. BM₃ O ₄
  3. CM₂ O ₅
  4. DM₂ O ₃

Correct answer

D. M₂ O ₃

Step-by-step solution

Unit cell of hcp structure =6 number of oxide ions per unit cell =6 number of octahedral voids =6 . Since, ferric ions occupy only two out of every three octahedral voids, number of octahedral holes occupied by ferric ions 2 3 6=4 stoichiometric ratio of metal and ion =4: 6=2: 3 . Hence, formula of metal oxide is M₂ O ₃ .

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