Oxygen has -1 oxidation state in the com...

Oxygen has `-1` oxidation state in the compound.

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The correct Answer is:

A:B:C

Caro's acid `H_2 SO_5` contains peroxide group. Marshall's acid `H_2 S_2 O_5` contains peroxo group. `BaO_2` is barium peroxide.
Above three contains peroxo hence oxygen state of `O` is `-1`, whereas in `K_2 O, O.S` , is `-2`.

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