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Which is/are correct statement about zinc blende structure?
(a) The number of first neighbour of \( \mathrm{S}^{2-} \) is 4
(b) The maximum distance between \( \mathrm{Zn}^{2+} \) is \( \frac{\mathrm{a} \sqrt{3}}{2} \), where \( a \) = edge length of unit cell
(c) If all tetrahedral voids are occupied by \( \mathrm{Zn}^{2+} \), then C.N. of \( \mathrm{S}^{2-} \) is 8 .
(d) If all tetrahedral voids are occupied by \( \mathrm{Zn}^{2+} \), then C.N. change from \( 4: 4 \) to \( 8: 8 \).
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