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4.Chemical Bonding and Molecular Structure
hard
Which of the following statement is correct for peroxide ion
$A.$ has completely filled antibonding molecular orbitals
$B.$ is diamagnetic
$C.$ has bond order one
$D.$ is isoelectronic with Neon
A
$B,\,C$
B
$A,\,B,\,D$
C
$A,\,B,\,C$
D
$A,\,D$
Solution
According to $MOT$
peroxide ion $\mathrm{O}_{2}^{-2}$
$\sigma_{1 \mathrm{s}}^{2} \sigma_{1 \mathrm{s}}^{* 2} \sigma_{2 \mathrm{s}}^{2} \sigma_{2 \mathrm{s}}^{* 2} \sigma_{2 \mathrm{g} z}^{*} \pi_{2 \mathrm{px}}^{2}=\pi_{2 \mathrm{py}}^{2} \pi_{2 \mathrm{px}}^{* 2}=\pi_{2 \mathrm{py}}^{* 2}$
dimegnetic $\&$ $B.O.$ $=\frac{10-8}{2}=1.0$
Standard 11
Chemistry
