Which of the following is not a true peroxide?A. `BaO_(2)`B. `MnO_(2)`C. `PbO_(2)`D. Both (2) and (3)

Which of the following is not a true peroxide?A. `BaO_(2)`B. `MnO_(2)`

1.	Which of the following is not a true peroxide?A. `BaO_(2)`B. `MnO_(2)`C. `PbO_(2)`D. Both (2) and (3)
Answer» Correct Answer - 4 They are dioxides.There are covalent matallic oxides which decompose when heated giving the basic oxide and oxygen.`(2PbO_(2)rarr2PbO+O_(2))`.They are oxidizing agents but they do not yield hydrogen peroxide solution when acidified and therefore should not be called peroxides. They evolve `Cl_(2)` with conc. `HCl` and `O_(2)` with conc `H_(2)SO_(4)` `MnO_(2)+4HClrarrMnCl_(2)+2H_(2)O+Cl_(2)uparrow` `MnO_(2)+2H_(2)SO_(4)rarr2MnSO_(4)+O_(2)+2H_(2)O` On the other hand ,`BaO_(2)`is a peroxide like`Na_(2)O_(3)`.These ionic compounds contain the peroxide ion`(O-O)^(2-)`.They all give hydrogen peroxide solution when treated with dilute acids: `Na_(2)O_(2)+H_(2)SO_(4)rarrNa_(2)SO_(4)+H_(2)O_(2)`

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Which of the following is not a true peroxide?A. `BaO_(2)`B. `MnO_(2)`C. `PbO_(2)`D. Both (2) and (3)

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