Make up the formulas of complex substances by determining the values of the indices X and Y:

Make up the formulas of complex substances by determining the values of the indices X and Y: FexCly, NaxSy, CrxOy, HxNy, AgxOy.

FeCl2 or FeCl3;
Na2S;
CrO or Cr2O3 or CrO2 or CrO3;
H3N;
Ag2O or Ag2O2.



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