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Among the species given below, the total...

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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KMnO_(4) = K_(2) MnO_(4) + MnO_(2) + O_(2)

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