Which of the following statements is correct in the zinc blende type structure of an ionic compo...

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Which of the following statements is correct in the zinc blende type structure of an ionic compound?
(a) Co-ordination number of each cation and anion is two
(b) Co-ordination number of each cation and anion is four
(c) Co-ordination number of each cation and anion is six
(d) Co-ordination number of each cation and anion is eight
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