BaO has a rock salt type structure. When subjected to high pressure, the ratio of the coordination number of Ba ion to O ion changes to

Question

BaO has a rock salt type structure. When subjected to high pressure, the ratio of the coordination number of Ba$^{2+}$ ion to O$^{2-}$ ion changes to

Prashant Kotian · Accepted Answer

Correct answer: C. BaO initially has a rock salt structure with a coordination number of 6:6. Under high pressure, the crystal lattice compresses, causing a phase transition to a more densely packed CsCl-type structure, which has a coordination number of 8:8. Therefore, correct answer is C.

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