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KVPY Sample Paper KVPY Stream-SX Model Paper-4

  • question_answer
    Iron oxide crystallises in a hexagonal close-packed array of oxide ions with two out of every three octahedral holes occupied by iron ions. Derive the formula of the iron oxide.

    A) \[FeO\]             

    B) \[F{{e}_{2}}{{O}_{3}}\]

    C) \[F{{e}_{3}}{{O}_{4}}\]                     

    D) All are possible

    Correct Answer: B

    Solution :

    [b] There is one octahedral hole for each atom in hexagonal close packed arrangement. If the number of oxide ions \[({{O}^{2-}})\] per unit cell is 1, then the number of \[{{F}^{e3+}}\] ions \[=2/3\times \]octahedral holes \[=2/3\times 1=2/3.\] Thus, the formula of the compound \[F{{e}_{2/3}}{{O}_{1}}\] or \[F{{e}_{2}}{{O}_{3}}.\]


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