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Of the following the most acidic is

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a

H3PO4

b

H3AsO4

c

H3SbO4

d

H3BiO4

answer is A.

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Detailed Solution

When oxidation state of central atom is same, with the decrease in electronegativity of central atom, acidic character decreases. Hence H3PO4 is most acidic.H3PO4>H3AsO4>H3SbO4>H3BiO4

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