Which combination is odd with respect to oxidation numbers of S, Cr, N and H respectively:\
(a) H2SO5, H2S2O8, H2SO4, SF6
(b) K2Cr2O7, K2CrO4, CrO5, CrO2Cl2
(c) NH3 , NH4+ , N3H, N
(d) CaH2 , NaH , LiH, MgH2
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(c) N in NH3 , NH4+ , N3H and N has -3, -3, -1/3 and +3 oxidation number respectively.