A) 8
B) 6
C) 4
D) 3
Correct Answer: B
Solution :
\[NaCl\]has octahedral crystal system, therefore co-ordination number of each\[N{{a}^{+}}\]and\[C{{l}^{-}}\]ion is 6. Co-ordination number of atom is determined that the given atom surrounded by how many numbers of atom. In\[NaCl\],each\[N{{a}^{+}}\]ion is surrounded by 6\[C{{l}^{-}}\]ions and each \[C{{l}^{-}}\]ions is surrounded by six\[N{{a}^{+}}\]ions. So they both show co-ordination number 6.
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