Answer
See the answer below.
Work Step by Step
a) $Ca^{2+}\lt K^+\lt Cl^-$
Ionic radius increase with a more negative charge due to electronic repulsion.
b) $Cl^-\lt K^+\lt Ca^{2+}$
Removing an electron from a more positively charged ion is harder than from a more negatively charged one.
c) $Ca^{2+}\lt K^+\lt Cl^-$
Adding an electron to a more negatively charged ion is harder than to a more positively charged one.
