Question

The species that do not contain peroxide ions are

• A. $N{a}_2{O}_2$
• B. $H_2{O}_2$
• C. $L{i}_{2}O$
• D. $K{O}_2$

Answer 1

Answer: (C), (D)

The correct options are
C $L{i}_{2}O$
D $K{O}_2$

All peroxides contain a peroxide ion $\left(O_2^{2–}\right)$ having the structure –O–O– . $N{a}_2{O}_2,H_2{O}_2$ contain a peroxide ion $\left(O_2^{2-}\right)$ and they are peroxides.
$L{i}_{2}O$ contains oxide ions $\left(O^{2-}\right)$, whereas $K{O}_2$ contains ions super oxide ions $O_2^{-}$. Thus Option C and D donot contain peroxide ion.