Chemical BondingHard
Question
Which one of the following compounds is a peroxide ?
Options
A.KO2
B.BaO2
C.MnO2
D.NO2
Solution
In peroxides, the oxidation state of O is - 1 and they give HO, with dilute acids, and have peroxide linkage.
In KO2,
+ 1 + (x × 2) = 0
x = - 1/2 (thus, it is super-oxide not a peroxide.)
In BaO2,
+ 2 + (x × 2) = 0
x = - 1
Thus, it is a peroxide Only it gives HO when reacts with dilute acids and has peroxide linkage as
Ba2+ [ O - O ]2-
peroxide linkage
In 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 BaO2 is peroxide.
In KO2,
+ 1 + (x × 2) = 0
x = - 1/2 (thus, it is super-oxide not a peroxide.)
In BaO2,
+ 2 + (x × 2) = 0
x = - 1
Thus, it is a peroxide Only it gives HO when reacts with dilute acids and has peroxide linkage as
Ba2+ [ O - O ]2-
peroxide linkage
In 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 BaO2 is peroxide.
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