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4. Chemical bonding and molecular structure — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry4. Chemical bonding and molecular structure1 Mark
MCQ
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
    $A,\,B,\,D$
  • ✓
    $A,\,B,\,C$
  • D
    $A,\,D$
✓

Answer

Correct option: C.
$A,\,B,\,C$
c
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 $\&$ $B.O.$ $=\frac{10-8}{2}=1.0$

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