Among the following oxo acids, the correct decreasing order of acid strength is

H_{6} T e O_{6} > H_{2} S e O_{4} > H_{2} S O_{4}

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H C l O_{4} > H C l O_{3} > H C l O_{2} > H O C l

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H O C l > H C l O_{2} > H C l O_{3} > H C l O_{4}

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H_{2} S O_{4} > H_{2} S e O_{4} > H_{6} T e O_{6}

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Solution

The correct option is D $H_{2} S O_{4} > H_{2} S e O_{4} > H_{6} T e O_{6}$
Acidic strength of oxoacids of chlorine is decided by the stability of their conjugate bases. Higher the stability of conjugate base, higher will be the acidic strength of the corresponding oxoacid. Based on the number of resonating structures, the stability order of anions of oxoacids of chlorine is
$C l O_{4}^{-} > C l O_{3}^{-} > C l O_{2}^{-} > C l O^{-}$
Acidic strength of oxoacids of the same type of elements belonging to the same group depends on the electronegativity of the central atom. Higher the electronegativity of central atom, higher the acidic strength. For example,
$H_{2} S O_{4} > H_{2} S e O_{4} > H_{6} T e O_{6}$

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