Q.
Among the species given below, the total number of diamagnetic species is ___.
$H$ atom, $NO_2$ monomer, $O_2^−$ (superoxide), dimeric sulphur in vapour phase,
$Mn_3O_4, (NH_4)_2[FeCl_4], (NH_4)_2[NiCl_4], K_2MnO_4, K_2CrO_4$
JEE AdvancedJEE Advanced 2018
Solution: