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I have two acids: $\ce{HClO4}$ and $\ce{HClO2}$ how do I determine which is the strongest acid without knowing $K_a$? The two hydrogens are bound both to an oxygen so there isn't anything to differentiate them, how can I proceed?

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$\ce{HClO4}$ is stronger acid due to the formation of more stable conjugate base. Also there are more number electronegative oxygen atoms in case of $\ce{HClO4}$ , so acidity should be more.

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