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Formula of a compound when cations occupy half of the tetrahedral voids

The same question, asked 2 times: 15 May 2023 S2, 19 Apr 2026 S2. Every wording below, oldest first.

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  1. Question 1

    15 May 2023 S2

    59
    In a solid, B−B^- ions occupy corners of a cube forming ccp structure. If A+A^+ ion occupy half the tetrahedral voids, formula of the solid is

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  2. Question 2

    19 Apr 2026 S2

    26
    In ionic solid, anions are arranged in hcp array and cations occupy 12\dfrac{1}{2} tetrahedral voids. What is the formula of ionic compound ? [Consider A = Cation ; B = anion]

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