Which combination gives strongest ionic bond?
(a)K+, Cl- (b) K+, O2- (c) Ca2+, Cl- (d) Ca2+, O2-

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Solution

More is the charge, more will be the strength of ionic bond. Ionic bonds are generally the Coulombic force which obey the Coulomb's law. So, more is the charge, more is the force of attraction.
So, Ca²⁺ and O^2- will have the strongest bond.

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The correct order of ionic size of the species $K^{+}, C l^{-}, C a^{2 +}$ and $S^{2 -}$ is:

K^{+}, C l^{-}, S^{2 -}, C a^{2 +}

S^{2 -}, K^{+}, C a^{2 +}, C l^{-}

S^{2 -}, N a^{+}, C a^{2 +}, C l^{-}

\begin{matrix} C l^{-}, A r, K^{+}, O^{2 -}, M g^{2 +}, F^{-} \end{matrix}

C a^{2 +}

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