A) \[HCl{{O}_{4}}\]
B) \[{{H}_{2}}S{{O}_{4}}\]
C) \[HCl\]
D) \[HN{{O}_{3}}\]
Correct Answer: A
Solution :
Perchloric acid \[(HCl{{O}_{4}})\] is the strongest acid. In it chlorine is in its maximum oxidation state (+7). The reason is that as the number of oxygen atom (highly electronegative) increases, the electron density on H-atom decreases. Hence, \[HCl{{O}_{4}}\] can very easily loose a proton. Therefore, it is the strongest acid.
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