What is the oxidation state of oxygen in O_2^ 2- ion?

MHT CET 2022 Chemistry question

What is the oxidation state of oxygen in ion?

(A)+2
(B)+1
(C)-2
(D)-1Correct

Answer: (D)

Solution

is the peroxide ion, . The sum of the oxidation numbers of the two oxygen atoms equals the charge on the ion: , so . Hence the oxidation state of each oxygen atom is , option (D). The value

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Question ID VK-093972