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Question

The species that does not contain peroxide ion is :
  1. PbO2
  2. H2O2
  3. SrO2
  4. BaO2

A
SrO2
B
PbO2
C
H2O2
D
BaO2
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)2having the structure OO . 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 [OO]2 ions (peroxide ions). Thus Option A is correct.

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