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Ionization Enthalpy

A solid compo...

Question

A solid compound $X Y$ has $N a C l$ structure. If the radius of the cation is $100 p m$ , the radius of the anion $(Y^{-})$ will be:

275.1 p m

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322.5 p m

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241.5 p m

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165.7 p m

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Solution

The correct option is D $241.5 p m$
$\frac{r^{+}}{r^{-}}$ =0.414 for $N a C l$
Substituting value $r^{-} = \frac{100}{0.414} = 241.5 p m$

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