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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
The spin-only magnetic moment value of $\mathrm{B}_{2}^{+}$ species is $......\,\times 10^{-2} \,\mathrm{BM}$. (Nearest integer)

[Given : $\sqrt{3}=1.73$ ]

  • A
    $243$
  • B
    $1$
  • ✓
    $173$
  • D
    $143$
✓

Answer

Correct option: C.
$173$
c
$\mathrm{B}_{2}^{+} \Rightarrow \sigma_{1 \mathrm{~s}}^{2} \sigma_{1 \mathrm{~s}}^{* 2} \sigma_{2 s}^{2} \sigma_{2 \mathrm{~s}}^{* 2} \pi_{2 \mathrm{py}}^{1} \simeq \pi_{2 \mathrm{pz}}^{0}$

$\Rightarrow 9 \mathrm{e}^{-}$

$\mu=\sqrt{1(1+2)}=\sqrt{3}\, \mathrm{BM}$

$=1.73 \,\mathrm{BM}$

$=1.73 \times 10^{-2}\, \mathrm{BM}$

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