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  4. The correct order of increasing hydration energy of the following conjugate bases of oxyacids of chlorine is

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Q. The correct order of increasing hydration energy of the following conjugate bases of oxyacids of chlorine is

The p-Block Elements - Part2

Solution:

Size varies inversely with hydration energy. Among the given oxyacids, $ClO _{4}^-$ has the smallest size because of the presence of $Cl ^{7+}$ followed by $ClO _{3}^{-}$ (with $Cl ^{+5}$ ), $ClO _{2}^{-}$ (with $Cl ^{3+}$ ). $ClO^-$ has the largest size with $Cl ^{+}$ ion. Hence, the order of increasing hydration energy is

$ClO ^{-}< ClO _{2}^{-}< ClO _{3}^{-}< ClO _{4}^{-}$