Single Choice

Which among the following is strongest acid?

A$$ \mathrm{H}(\mathrm{ClO}) \mathrm{O}_{2} $$
B$$ \mathrm{H}(\mathrm{ClO}) \mathrm{O}_{3} $$
Correct Answer
C$$ \mathrm{H}(\mathrm{ClO}) \mathrm{O} $$
D$$ \mathrm{H}(\mathrm{ClO}) $$

Solution

For oxoacids of the same element, the acidic strength increases with increase in the oxidation number of that element.
$$\underset{HClO}{+1} < \underset{HClO_2}{+3} < \underset{HClO_3}{+5} < \underset{HClO_4}{+7}$$

Negative charge in conjugate base is stabilised by more number of chlorine atoms, so more stable conjugate base , stronger is the acid.

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Acids, Bases and Salts

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