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Which of the following is the correct order of decreasing ionic size is

$\begin{array}{1 1}(a)\;K^+ > Ca^{2+} > S^{2-} > Cl^-\\(b)\;S^{2-} > Cl^- > K ^+ > Ca^{2+}\\(c)\;K^+ > Cl^- > Ca^{2+} > S^{2-}\\(d)\;Cl^- > K^+ > S^{2-} > Ca^{2+} \end{array}$

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Decreasing ionic size is $S^{2-} > Cl^{-} > K^+ > Ca^{2+}$
Hence (b) is the correct answer.
answered Mar 7, 2014 by sreemathi.v

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