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4.Chemical Bonding and Molecular Structure
medium
Which of the following is paramagnetic ?
A
$O_2[AsF_6]$
B
$Al_2O_3$
C
$C_2$
D
$Be_2$
Solution
In $\mathrm{O}_{2}\left[\mathrm{AsF}_{6}\right], \mathrm{O}_{2}^{+}$ ion have one unpaired electron. $\mathrm{Al}_{2} \mathrm{O}_{3}$ is oxide in which $\mathrm{Al}^{3+}$ and $\mathrm{O}^{2-}$ ion do not have any unpaired electrons.
$\mathrm{C}_{2}=\sigma 1 \mathrm{s}^{2}, \sigma^{*} 1 \mathrm{s}^{2}, \sigma 2 \mathrm{s}^{2}, \sigma^{*} 2 \mathrm{s}^{2}, \pi 2 \mathrm{p}_{\mathrm{x}}^{2}, \pi 2 \mathrm{p}_{\mathrm{y}}^{2}$
Number unpaired electrons.
$\mathrm{Be}_{2}=\sigma 1 \mathrm{s}^{2}, \sigma^{*} 1 \mathrm{s}^{2}, \sigma 2 \mathrm{s}^{2}, \sigma^{*} 2 \mathrm{s}^{2}$
No unpaired electrons.
Standard 11
Chemistry
