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Stereoisomerism

In zinc blend...

Question

In zinc blende structure, anions are arranged in ccp and cations are present in the tetrahedral voids and only half the tetrahedral voids are occupied.
For this type of structure, radius ratio, $\frac{r_{+}}{r_{-}}$ should be in the range of

A

0.225 - 0.414

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B

0.155 - 0.225

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C

0.414 - 0.732

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D

0.732 - 1

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Solution

The correct option is B $0.225 - 0.414$
For tetrahedral voids $0.225 < \frac{r_{+}}{r_{-}} < 0.414$

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If 'a' is the edge length of the unit cell, then for zinc blende structure the distance of closest approach between cation and anion is :

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