MCQ
Which of the following is paramagnetic ?
- A$N{O^ + }$
- B$CO$
- C$O_2^{2 - }$
- ✓$B_2$
$NO^+$ $14$
$CO$ $14$
$O_2^{2-}$ $18$
$B_2$ $10$
$N{O^ + } \Rightarrow KK.\sigma {(2s)^2}{\sigma ^*}{(2s)^2}.{(\pi 2{p_x})^2}$
$ = {(\pi 2{p_y})^2}.{(\sigma 2{p_z})^2}$ diamagnetic
$CO \Rightarrow KK.\sigma {(2s)^2}{\sigma ^*}{(2s)^2}.{(\pi 2{p_x})^2}$
$ = {(\pi 2{p_y})^2}.{(\sigma 2{p_z})^2}$ diamagnetic
$O_2^{2 - } \Rightarrow KK.\sigma {(2s)^2}{\sigma ^*}{(2s)^2}.\sigma {(2{p_z})^2}{(\pi 2{p_x})^2}$
$ = {(\pi 2{p_y})^2}.{\pi ^*}{(2{p_x})^2} = {\pi ^*}{(2{p_y})^2}$ diamagnetic
${B_2} \Rightarrow KK.\sigma {(2s)^2}{\sigma ^*}{(2s)^2}.\pi {(2{p_x})^1} = \pi {(2{p_y})^1}$ paramagnetic
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$\Delta_{\text {vap }} \mathrm{H}-\Delta_{\text {vap }} \mathrm{U}=...... \times 10^{2} \,\mathrm{~J}\, \mathrm{~mol}^{-1}$. (Round off to the NearestInteger)
$\left[\right.$ Use : $\left.R=8.31\, \mathrm{~J}\, \mathrm{~mol}^{-1}\, \mathrm{~K}^{-1}\right]$
[Assume volume of $\mathrm{H}_{2} \mathrm{O}(\mathrm{l})$ is much smaller than volume of $\mathrm{H}_{2} \mathrm{O}(\mathrm{g})$. Assume $\mathrm{H}_{2} \mathrm{O}(\mathrm{g})$ treated as an ideal gas]