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Density

A solid AB ha...

Question

A solid AB has NaCl structure. If radius of $A^{+}$ is 100 pm. What is the radius of $B^{-}$ ion ?

120 pm

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136.6 to 216.4 pm

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136.6 to 241.6 pm

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280 pm

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Solution

The correct option is D 136.6 to 241.6 pm
Since AB is NaCl like ionic compound
Radius ratio= $\frac{R_{a}}{R_{b}} = 0.414$
so $R_{b} = \frac{100}{0.414}$
$R_{b} = 241 p m$

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