The bond order in $N_2^ + $ ion is

Which one of the following pairs of species have the same bond order ?

Oxygen molecule is paramagnetic because

Which of the following is paramagnetic

According to $MO$ theory, number of species/ions from the following having identical bond order is $.........$

$CN ^{-}, NO ^{+}, O _{2}, O _{2}^{+}, O _{2}^{2+}$

Among the following species$N _{2}, N _{2}^{+}, N _{2}^{-}, N _{2}{ }^{2-}, O _{2}, O _{2}{ }^{+}, O _{2}^{-}, O _{2}{ }^{2-}$ the number of species showing diamagnetism is.