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Manipal Entrance Test 2014 Chemistry Paper

Question : 53 of 60

Marks: +1, -0

Strongest conjugate base is

Solution:

If acid is weak, its conjugate base is strong.

Greater the oxidation number of Cl, stronger the acid and thus, weaker the conjugate base.

\begin{array}{cccc} \mathrm{HClO} & \mathrm{HClO}_2 & \mathrm{HClO}_3 & \mathrm{HClO}_4 \\ +1 & +3 & +5 & +7 \end{array}

\text{–––––––– ––––––––––––– ––––– 🢖}

Oxidation number of Cl and acid strength increases

\mathrm{ClO}^- \quad \mathrm{ClO}_2^- \quad \mathrm{ClO}_3^- \quad \mathrm{ClO}_4^-

\text{◂–––––––––––––––––––––}

Conjugate base strength increases.

Hence, CIO

^{-}

is the strongest base.

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