The species that does not contain peroxide ion is :
PbO2
H2O2
SrO2
BaO2
A
SrO2
B
PbO2
C
H2O2
D
BaO2
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Solution
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Metallic oxides which on treatment with dilute acids produce hydrogen peroxide are called peroxides. All peroxides contain a peroxide ion (O2)2–having the structure –O–O– . PbO2 does not contain a peroxide ion (O2)2− and it can not be called as peroxides.
PbO2 contains O2− ions and Option (A) Pb is +4, whereas (B), (C) and (D) contains [O–O]2− ions (peroxide ions). Thus Option A is correct.
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