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How many effiective Na^(+) and Cl^(-...

How many effiective `Na^(+)` and `Cl^(-)` ions are present respectively in a uint cell of NaCl solid (Rock salt structure ) if all ions along line connecting opposite face centres are absent ?

A

3,3

B

`(7)/(2),4`

C

`(7)/(2),(7)/(2)`

D

`4,(7)/(2)`

Text Solution

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The correct Answer is:
A
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