A solid $A B$ has $N a C l$ structure. If the radius of cation is $100 p m$ , what will be the maximum radius of anion $B^{-}$ ?

241.54 p m

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136.61 p m

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120.7 p m

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68.3 p m

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Solution

The correct option is A $241.54 p m$
$N a C l$ has coordination number of $6$ . Thus, radius ratio of $A B$ will be between $0.414$ and $0.732$ . For maximum radius,
$\frac{r_{+}}{r_{-}} = 0.414$
$\frac{100}{r_{-}} = 0.414$
$r_{-} = 241.54 p m$

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A solid AB has NaCl type structure. If the radius of cation A is 100 pm, then the radius of the anion B will be

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