A) SrO
B) BaO
C) MgO
D) CaO
Correct Answer: C
Solution :
\[\text{Lattice}\,\text{energy}=\frac{-({{Z}^{+}}{{Z}^{-}}{{e}^{2}})}{r}\] Here, r is the interionic distance and it is minimum in case of MgO. So, MgO has the highest lattice energy here. Hence, the correct option is [c].
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