Q. AB is an ionic solid. The ionic radii of $A^{+}$ and $B^{+}$ are respectively $r_{c}\$and$\ r_{a}.$ Lattice energy of AB is proportional to
A) $\frac{r_{c}}{r_{a}}$
B) $(r_{c} + r_{a})$
C) $\frac{r_{a}}{r_{c}}$
D) $\frac{1}{(r_{c} + r_{a})}$
Explanation
(d)
The lattice becomes stronger (i.e., the lattice energy U becomes more negative). As r the interionic distance decreases. U is proportional to $\frac{1}{r}$
or $U \propto \frac{1}{(r_{c} + r_{a})}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.