Which of the following statement is/are correct'?

Moderate

A

The peroxide ion has a bond order of 1 while the oxygen molecule has a bond order of 2.
B

The peroxide ion has a weaker bond than the dioxygen molecule has.
C

The peroxide ion as well as the dioxygen molecules are paramagnetic
D

The bond length of the peroxide ion is greater than that of the dioxygen molecule.

Solution

1) $\underset{B . O . = 1}{\underset{↓}{Peroxide ion (O_{2}^{2 -})}} \underset{B . O . = 2}{\underset{↓}{Oxygen (O_{2})}}$
2) $B.O. \propto \frac{1}{B.L.}$
$\Rightarrow$ Peroxide has weaker bond compound to O₂
3) $\begin{array}{cc} O_{2}^{2 -} (18 \bar{e}) & O_{2} (18 \bar{e}) \\ diamagnetic & ↓ \\ Paramagnetic \end{array}$
4) Correct.

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