Which one of the following compounds is a peroxide

Asked by admin @ 13/08/2021 in Chemistry viewed by 316 People

Which one of the following compounds is a peroxide ?

(a) KO₂
(b) BaO₂
(c) MnO₂
(d) NO₂

Answered by admin @ 13/08/2021

Key Idea In peroxides, the oxidation state of O is -1 and they give H2O2, with dilute acids, and have peroxide linkage.

In K02,

+1 + (x

× 2)=0

x = -1/2 (thus, it is a superoxide, not a peroxide.)

In BaO2,

+2 + (x

×2) = 0

x = -1

Thus, it is a peroxide. Only it gives H2O2 when reacts with dilute acids and has peroxide linkage as

Ba2+ [O - O]2-

(peroxide linkage)

MnO

MnO2 and

NO2, Mn and N exhibit variable oxidation states, thus, the oxidation state of O in these is - 2. Hence, these are not peroxides. Thus, it is clear, that among the given molecules only

BaO

BaO2 is a peroxide.

B✔✔✔✔✔

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