Question

$BaO$ has a rock-salt type structure. When subjected to high pressure, the ratio of the coordination number of $B{a}^{+2}\text{ion to}{O}^{-2}$ changes to

• A. $4:8$
• B. $8:4$
• C. $8:8$
• D. $4:4$

Answer 1

The correct option is C $8:8$

On increasing pressure, the atoms are come closer to each other. so the coordination number increases.
$\Rightarrow 6:6\text{changes to}8:8.$