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# How does the strength of the charge-charge interaction between two ions depend on the separation in the absence of any other ions?

$\begin{array}{1 1}(a)\;\propto \large\frac{1}{r^6}&(b)\; \propto \large\frac{1}{r^3}\\(c)\;\propto \large\frac{1}{r^2}&(d)\;\propto \large\frac{1}{r}\end{array}$

In the absence of any other ion,relation between the various types of intractions and the distance of separation are given below
$\propto \large\frac{1}{r}$ for charge-charge interactions
$\propto \large\frac{1}{r^2}$ for ion dipole interactions
$\propto \large\frac{1}{r^3}$ for dipole-dipole interactions
$\propto \large\frac{1}{r^6}$ for dispersion interactions
Hence (d) is the correct answer.