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