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Compound \( \mathrm{X}_{2} \mathrm{Y} \) have antifluorite structure. Which is/are correct statement?
(a) The minimum distance between \( \mathrm{X}^{+} \)is \( \frac{\mathrm{a}}{2} \), where \( a \) = edge length of unit cell.
(b) The co-ordination number ratio of \( \mathrm{x} \) and \( \mathrm{y} \) is \( 8: 4 \).
(c) If \( \mathrm{X}^{+} \)is removed from alternate tetrahedral void, then \( \mathrm{CN} \) is \( 4: 4 \).
(d) If \( \mathrm{X}^{+} \)is removed from alternate tetrahedral void, then \( \mathrm{CN} \) is \( 4: 8 \).
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