[2000]
(a) $N_2, CO_2, CN^{-}, O_2$
(b) $N, H_2 S, CO$
(c) $N_2, CO, CN^{-}, O_2^{+2}$
(d) $Ca, Mg, Cl$
$N_2=CO=CN^{-}=O_2^{+2}=14 e^{-}$
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