| Column $I$ | Column $II$ |
| $(A)$ $B_2$ | $(p)$ Paramagnetic |
| $(B)$ $N_2$ | $(q)$ Undergoes oxidation |
| $(C)$ $O_2^{-}$ | $(r)$ Undergoes reduction |
| $(D)$ $O_2$ | $(s)$ Bond order $\geq 2$ |
| $(t)$ Mixing of '$s$' and '$p$' orbitals |
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| Pair of species | Identical property |
|---|---|
| $A$. $B_2 \& O_2$ | $P$. Bond order $= 2.5$ |
| $B$. $Be_2 \& H_2^{2-}$ | $Q$. Paramagnetic nature |
| $C$. $N_2^{+} \& N_2^{-}$ | $R$. Diamagnetic nature |
| $D$. $O_2^{+} \& O_2^{-}$ | $S$. Doesn't exist |
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