(a) Ferric oxide crystallizes in a hexagonal close - packed array of o – InterviewSolution

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1.	(a) Ferric oxide crystallizes in a hexagonal close - packed array of oxide (O^(2-)) ions with two out of every three octahedral holes occupied by iron ions. What is the formula of ferric oxide ?(b) In cadium iodide every alternate octahedral hole in an HCP array of iodide I^(-) ions is occupied by a cadmium ion. What is the formula of cadium iodide.
Answer» Answer :(a) `Fe_(4)O_(6)` or `Fe_(2)O_(3)`,(b) `CaCl_(3)` or `Cdl_(2)`

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