Which of the following does not contain a peroxy bond

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Na2O2

BaO2

MnO2

H2S2O8

answer is C.

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Detailed Solution

Na+ calculated oxidation number is "+2"it is greater than its group number, therefore it contains peroxy linkage→ x+2[-2] = 0X = +4⇒ In BaO2 the calculated oxidation state of Ba is +4, it is greater than its group number,therefore BaO2 also contain peroxy bond.⇒ MnO2x + 2(-2) =0X=+4In MnO2 the calculated oxidation state of Mn is +4, it is less than it's group number, therefore MnO2 does not contain peroxy bond.⇒ H2S2O82[H] + 2x + 8(-2) = 02X = 16-22x = 14 In H2S2O8 , the calculated oxidation state of "S" is +7, it is greater than it's group number and hence the molecule contains peroxy linkage in peroxy bond each "O" oxidation state (-1)

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