The number of halogen(s) forming halic (V) acid is/are

3.00

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3.0

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Solution

$X O_{3}^{-}$ can be formed by all the halides that have vacant d orbitals. Here X is halogen
Except $F$ all other halogens (which are not radioactive) have vacant d orbitals.
So answer is 3 i.e. $C l, B r, I$

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