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\( \mathrm{KCl} \) crystallizes in the same type of lattice as does \( \mathrm{NaCl} \). Given that \( \frac{\mathrm{r}_{\mathrm{Na}^{*}}}{\mathrm{r}_{\mathrm{Cl}^{-}}}=0.5 \) and \( \frac{\mathrm{r}_{\mathrm{K}^{*}}}{\mathrm{r}_{\mathrm{Cl}^{-}}}=0.7 \). Calculate :
\( \mathrm{P} \)
(a) The ratio of the sides of unit cell for \( \mathrm{KCl} \) to that for \( \mathrm{NaCl} \) and
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(b) The ratio of densities of \( \mathrm{NaCl} \) to that for \( \mathrm{KCl} \).
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