JEE Main 2022 — Solid State Question with Solution

In given ionic compound anions form CCP lattice, And cation is present in octahedral void. Means this structure is similar to structure of NaCl. Which is also called rock salt structure.

Edge length = $\mathrm{a}=?$

In rock salt structure cations and anions are in contact along the edge of the cube. 

So, $\mathrm{a}=2\left({\mathrm{r}}_{+}+{\mathrm{r}}_{-}\right)$

$\mathrm{a}=2\left(102+181\right)$

$\mathrm{a}=2\left(283\right)$

$\mathrm{a}=566 \mathrm{pm}$