Question

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 oxyanions of pyro acid has different oxidation state of central metal atoms?

• A. $S_3{O}_6^{2-}$
• B. $S{i}_2{O}_7^{6-}$
• C. $S_2{O}_5^{2-}$
• D. None

Answer 1

The correct option is C $S_2{O}_5^{2-}$


(a) $S_3{O}_6^{2-}$ have $+5$ oxidation state on both $S$ central atoms.
(b) $S{i}_2{O}_7^{6-}$ have $+6$ oxidation state on both $S$ central atoms.
(c) $S_2{O}_5^{2-}$ have $+5$ oxidation state on one $S$ central atom and $+3$ on another $S$ central atom.