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Examples of Ionic Compounds

If the distan...

Question

If the distance between $N a^{+}$ and $C l^{-}$ ions in $N a C l$ crystal is $a$ pm, the edge length (in pm) of the unit cell is__________.

4 a

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\frac{a}{4}

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\frac{a}{2}

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2 a

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Solution

The correct option is D $2 a$
As we know, the edge length $= 2 \times$ distance between $N a^{+}$ and $C l^{-}$ $= 2 a$ pm

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