A) \[HCl{{O}_{4}}>HBr{{O}_{4}}>HI{{O}_{4}}\]
B) \[HCl{{O}_{4}}>HI{{O}_{4}}>HBr{{O}_{4}}\]
C) \[HI{{O}_{4}}>HCl{{O}_{4}}>HBr{{O}_{4}}\]
D) \[HI{{O}_{4}}>HBr{{O}_{4}}>HCl{{O}_{4}}\]
Correct Answer: A
Solution :
\[HCl{{O}_{4}}>HBr{{O}_{4}}>HI{{O}_{4}}\] The acidic character of oxyacids of different elements which are in same oxidation decreases with increase in the atomic number due to increase in size and decrease in electronegativity. Therefore, more electronegative \[HCl{{O}_{4}}\]can easily denote \[{{H}^{+}}\]to other substances. Thats why \[HCl{{O}_{4}}\] is most acidic.
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