🧪 Chemistry · Solid State · NEET & JEE

Oxide ions form a ccp lattice while metal ions occupy all the octahedral and all the tetrahedral voids. The formula of the oxide is:

Answer: M₃O.

A M₂O
B M₃O
C MO
D M₂O₃

Correct answer: B. M₃O

Explanation: For N oxide ions there are N octahedral and 2N tetrahedral voids; filling all gives 3N metal ions, so M:O = 3:1, i.e. M₃O.

The three cubic unit cells: Simple Cubic has atoms only at corners; Body-Centred adds one atom at the centre; Face-Centred adds one atom at the centre of each of the 6 faces, giving the highest packing efficiency.

Concept context

Explore the ordered world of crystalline solids: unit cells, packing, defects, and how structure determines electrical and magnetic properties.

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Oxide ions form a ccp lattice while metal ions occupy all the octahedral and all the tetrahedral voids. The formula of the oxide is:

Concept context

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