[AIIMS 2003]
A) 6
B) 4
C) 8
D) 2
Correct Answer: B
In $ Na_2O, $ each oxide ions $ ({{O}^{2-}}) $ is co-ordinated to $ 8N{{a}^{+}} $ ions and each $ N{{a}^{+}} $ ion to 4 oxide ions. Hence it has 4 : 8 co-ordination.
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