First slide
Group16 or Oxygen family
Question

Oxygen has -1 oxidation state in the compound

Easy
Solution

(1, 2, 3)

Caro's acid H2SO5 contains peroxide group.

Marshall's acid H2S2O5 contains peroxo group. BaO2 is barium
peroxide.

Above three contains peroxo group hence oxygen state of O is -1, whereas in K2O,O.S. is -2.

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