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In which case the order of acidic strength is not correct ?

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In which case the order of acidic strength is not correct ?
A. `HI gt HBr gt HCl`
B. `HIO_(4) gt HBrO_(4) gt HClO_(4)`
C. `HClO_(4) gt HClO_(3) gt HClO_(2)`
D. `HF gt H_(2) O gt NH_(3)`
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Correct Answer - B
As the electronegativity of central atom increases, acidic strength of oxo-acids increases. Hence, correct order is : `HClO_(4)gtHBrO_(4)gtHIO_(4)`
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