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S(1): Distance between Na^(+) " & " Cl^(...

`S_(1)`: Distance between `Na^(+) " & " Cl^(-)` in NaCl crystal is more than half of edge length.
`S_(2)`: The no. of triangular viods in the given arrangement in the enclosed region is 3

`S_(3)`: In ZnS structure, `2Zn^(2+) " & " 2S^(2-)` ions are present in each unit cell

A

FFT

B

FTF

C

TFF

D

FFF

Text Solution

Verified by Experts

The correct Answer is:
D
`S_(1) :` edge length `= 2 (r_(Na^(+)) + r_(Cl^(-)))`
distance b/w `Na^(+) and Cl^(-)` is less than edge length
`S_(2)` : 4 triangular void
`S_(3)` : in Zns strucutre `4 Zn^(+2) and 4s^(-2)` present in each unit cell
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