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If the distan...

Question

If the distance between $N a^{+}$ and $C l^{-}$ ions in NaCl crystal is $α$ pm, the edge length of the unit cell is:

A

$4 α p m$

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B

$\frac{α}{4} p m$

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C

$\frac{α}{2} p m$

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D

$2 α p m$

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Solution

The correct option is D
$2 α p m$

The edge length = $2 \times$ distance between $N a^{+}$ and $C l^{-}$ .

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