1.

The strongest acid is

Answer»

`H_(3)AsO_(4)`
`H_(3)AsO_(3)`
`H_(3)PO_(3)`
`H_(3)PO_(4)`

Solution :`H_(3)PO_(4)` and `H_(3)AsO_(4)` both have +5 oxidation state. But for same oxidation state, strength of OXY acids decrease, with increase in size.


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