11. Вкажіть групу речовин, яка містить лише оксиди:
a) FeO, FeS, NО2
б) N2O, Na2O, NaCl;
в)K2O, CrO3, Cr2O3
r) FeO, Fe2О3, FeS;
д) K3N, KH, K2O.
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