Which is the strongest acid in the following?

Which is the strongest acid in the following?
  1. $\mathrm{H}_2 \mathrm{SO}_4$
  2. $\mathrm{HClO}_3$
  3. $\mathrm{HClO}_4$
  4. $\mathrm{H}_2 \mathrm{SO}_3$

Solution

The strength of axyacids can also be decided with the help of the oxidation number central atom. Higher the oxidation number of central atom, more acidic is the oxyacid.
Since, in $\mathrm{HClO}_4$, oxidation number of $\mathrm{Cl}$ is highest, so $\mathrm{HClO}_4$ is the strongest acid among the given.

Asked in: NEET 2013 (All India)

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