In respect of acid strengths which of the following relationships are correct?
The correct answer is

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$H_{2} O > H_{2} Te$

$H_{2} O < H_{2} O_{2}$

$H_{2} {SO}_{3} > H_{2} {SeO}_{3}$

$HCIO < {HCIO}_{2}$

answer is B, C, D.

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Detailed Solution

The relationships
(1) larger the size of electronegative element, stronger the strength. The size of Te is more than O. So, the acid strength of H₂Te is more than H₂O.So (1) is incorrect.
(2)Higher the oxidation number of electronegative element. stronger is the acid strength. oxidation number of ‘O’ in H₂O₂ = - 1 Oxidation numbe of ‘O’ in H₂O = - 2 Since -1 >-2,the acid strength of H₂O₂is more than acid strength of H₂O.So (2) is correct.
(3) Larger electronegativity of the central atom, stronger the acid strength. In H₂SO₃and H₂SeO_3,the electronegativity of ‘S’ is more than Se. So the acid strength of H₂SO₃ is more than that of H₂SeO₃So (3) is correct.
(4) In oxy acids, the lower the effective charge on oxygen atom, stronger is the acid strength. HCIO ionizes to CIO^-1charge per oxygen atom is one. HCIO₂ionizes to ${CIO}_{2,}^{- 1}$ charge per oxygen atom is $\frac{1}{2}$ . Since the average charge is less in HCIO, the strength of HCIO is less than HCIO_2. So (4) is correct.