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Hydrogen Peroxide

A solid AB ha...

Question

A solid $A B$ has the $NaCl$ structure. If radius of the $A^{+}$ is $120 pm$ , calculate the maximum value of the radius of the anion $B^{-}$ .

290 pm

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360 pm

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450 pm

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188 pm

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Solution

The correct option is A 290 pm
Since, $NaCl$ has octahedral structure,

The limiting ratio $\frac{r_{A}^{+}}{r_{B}^{-}} = 0.414$
$or r_{B}^{-} = \frac{r_{A}^{+}}{0.414} = 290 p m$

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