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Salt AB has a zinc blende structre. The ...

Salt AB has a zinc blende structre. The radius of `A^(2+)` and `B^(2-)` ion are `0.7Å and 0.Å` respectively. The edge length of AB unit cell is:

A

2.5 Å

B

5.09 Å

C

5.77 Å

D

5 Å

Text Solution

Verified by Experts

The correct Answer is:
C
In ZnS like structure
`r_(s^(2-))+r_(Zn^(2+))=(a sqrt3)/(4)`
`0.7+1.8=(sqrt3)/(4)xxa`
`(2.5xx4)/(1.732)=a=5.77 Å`
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