Paramagnetism is exhibited by molecules
Not attracted into a magnetic field
Containing only paired electrons
Carrying a positive charge
Containing unpaired electrons
Which of the following statement is correct for peroxide ion
$A.$ has completely filled $\pi$ antibonding molecular orbitals
$B.$ is diamagnetic
$C.$ has bond order one
$D.$ is isoelectronic with Neon
Among the following, the species having the smallest bond is
Among $\mathrm{H}_2, \mathrm{He}_2^{+}, \mathrm{Li}_2, \mathrm{Be}_2, \mathrm{~B}_2, \mathrm{C}_2, \mathrm{~N}_2, \mathrm{O}_2^{-}$, and $\mathrm{F}_2$, the number of diamagnetic species is (Atomic numbers: $\mathrm{H}=1, \mathrm{He}=2, \mathrm{Li}=3, \mathrm{Be}=4, \mathrm{~B}=5, \mathrm{C}=6, \mathrm{~N}=7, \mathrm{O}=8, \mathrm{~F}=9$ )
Correct order of bond length is
Explain energy level diagram for molecular orbital form by $1\mathrm{s}$ orbitals.