Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
If the limiting radius ratio\[\left( \frac{{{r}^{+}}}{{{r}^{-}}} \right)\]is the range of 0.225 to 0.414, there is: tetrahedral voids co-ordination number 4 zinc blende structure \[NaCl\]type structureA) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: A
Solution :
\[ZnS\](zinc blende) has a co-ordination number 4. Its arrangement is tetrahedral and limiting radius ratio\[({{r}^{+}}/{{r}^{-}})\]is in the range of 0.225 to 0.414.
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