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Comprehension V
KCl crystallizes in the same type of lattice as does \( \mathrm{NaCl} \) (rock salt structure). Given that \( r_{\mathrm{Na}^{+}} / r_{\mathrm{k}^{+}}=0.5 \) and \( r_{\mathrm{Na}^{+}} / r_{\mathrm{Cl}^{-}}=0.7 \).
The ratio of density of \( \mathrm{NaCl} \) to that of \( \mathrm{KCl} \) is
(a) \( 1.49 \)
(b) \( 1.17 \)
(c) \( 0.853 \)
(d) \( 1.143 \)
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