Question

The species that does not contain peroxide ion is

• A. $PbO_{2}$
• B. $H_{2}O_{2}$
• C. $SrO_{2}$
• D. $BaO_{2}$

Answer 1

Answer: (A)

$PbO_{2}$

Answer 2

(1) PbO2 contains O-2 ions and O.S of Pb is +4 , whereas (2),(3) and (4) contains

[O - O]-2 ions ( peroxide ions )