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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_(3)O_(4),(NH_(4))_(2)["FeCl"_(4)], (NH_(4))_(2)["NiCl"_(4)],K_(2)MnO_(4), K_(2)CrO_(4) |
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