Select ALL species that contain oxygen atoms with oxidation number -1 (use the known structures: CrO5 has two peroxo groups, H2SO5 has one, S2O8^2- has one, S2O7^2- has an S-O-S link only).

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Select ALL species that contain oxygen atoms with oxidation number $- 1$ (use the known structures: $CrO X_{5}$ has two peroxo groups, $H X_{2} SO X_{5}$ has one, $S X_{2} O X_{8} X^{2 -}$ has one, $S X_{2} O X_{7} X^{2 -}$ has an S-O-S link only).

Peroxo O-O links are present in

CrO X_{5}

H X_{2} SO X_{5}

and

S X_{2} O X_{8} X^{2 -}

, giving O

= - 1

S X_{2} O X_{7} X^{2 -}

has bridging O only, with O

= - 2

and S

= + 6