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Which is the strongest acid in the following?
A
$H_2SO_3$
B
$H_2SO_4$
C
$HClO_3$
D
$HClO_4$
Detailed Solution
Acid strength increases with the oxidation state and electronegativity of the central atom.
In $HClO_4$ chlorine is in the +7 state and $ClO_4^-$ is the most stabilised conjugate base, so it is the strongest acid.
In $HClO_4$ chlorine is in the +7 state and $ClO_4^-$ is the most stabilised conjugate base, so it is the strongest acid.