Problem

### PASSAGE 1 Each oxy-acid contains at least one

X-OH

unit (

X

is non-metal). The H-atom of

X-OH

unit is ionisable and the number of

-OH

groups directly attach to non-metal decides the basicity of oxy-acid. Which of the following oxyanion of Pyro acid has different oxidation state of central atom ? a.

S_3O_6^{2-}

Si_2O_7^{6-}

S_2O_5^{2-}

d. None

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