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Of the following the most acidic is.

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Of the following the most acidic is.
A. `H_3 PO_4`
B. `H_3 AsO_4`
C. `H_3 SbO_4`
D. `H_3 BiO_4`
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Correct Answer - A
When oxidation state of central atom is same, with the decrease in electronegativity of central atom, acidic character decreases. Hence `H_3 PO_4` is most acidic.
`H_3 PO_4 gt H_3 AsO_4 gt H_3 SbO_4 gt H_3 BiO_4`.
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