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Question:

Among the species given, the total number of diamagnetic species is __________. H atom, NO2 monomer, O2⁻ (superoxide), dimeric sulphur in vapour phase, Mn3O4, (NH4)2[FeCl4], (NH4)2[NiCl4], K2MnO4, K2CrO4.

Solution:

Hence, answer is one.