Explain why HClO4 is stronger acid than HClO?

in HCIO4 cl-ionhas +7and in HCIO +1 oxidation state so more stronger
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due to the presence of 4 electronegative oxygen atoms the Cl-H bond is more polar and due the oxidation state of chlorine  (+7) HCLO4 is more acidic
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i mean O-H bond
 
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HCLO4 has 4 guys while the other is .............
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Acidic character increases with the increase in oxidation number
since Cl in HClO4 is in +7 oxidation it is more acidic than HClO where Cl is in +1 oxidation state
 
hope it helps!!
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4 guys??
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HClO4 is more acidic than HClO3 because of the following reasons:

  1. pKa of HClO4 (-10) is lower than HClO3 (-1). Acids with lower pKa are stronger.
  2. Using resonance to explain—ClO4- is a more stable conjugate base than ClO3- because it has more resonance structures as follows:

vs

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With increase in oxidation number of a particular halogen atom, the acidic character of corresponding oxoacid increases.

According to Lowry-Bronsted  concept, a strong acid has weak conjugate base and a weak acid has a strong conjugate base. Now, let us consider the stabilities of the conjugate bases ClO4-, ClO3-, ClO2bases, ClO formed from these acids, HClO, HClO2, HClO3 and HClO4 respectively. These anions are stabilised to greater extent, it has lesser attraction for proton and therefore, will behave as weaker base. Consequently, the corresponding acid will be strongest because weak conjugate base has strong acid and strong conjugate base has weak acid and vice versa

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