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# KCI crystallises in the same type of lattice as does NaCl. Given that $\large\frac{r_{k^+}}{r_{cl^-}} =$$0.74 and \large\frac{r_{k^+}}{r_{cl^-}}$$=0.74$. Calculate the ratio of the side of the unit cell for KCl to that of NaCl.

1.122
Hence (A) is the correct answer.