TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Components: The array is situated within the gas mixture, which has a temperature of at least 400 degreesC. The device for performing analysis is a device for calculating the concentration within the gas mixture of the individual gas component. The apparatus further includes a device determining a value for the temperature of the gas mixture connected in parallel circuitry with the chemo/electro-active materials.Preferred Method: The analysis is performed from the electrical responses of the chemo/electro-active materials upon exposure to the multi-component gas mixture only. The individual gas component is analyzed from digitized electrical responses and a digitized temperature value.Preferred Parameters: The electrical responses can be resistance, impedance, capacitance, voltage or current.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Materials: At least one of the chemo/electro-active material has an electrical resistivity at 1-1x105 ohm-cm, and exhibits a change in electrical resistance of at least 0.1% upon exposure of the material to an individual gas component, as compared to the resistance before exposure. The chemo/electro-active material is a metal oxide. The chemo/electro-active materials are formed from pairings of first and second materials (i) M1Ox and M1aM2bOx; (ii) M1Ox and M1aM2bM3cOx; (iii) M1aM2bOx and M1aM2bM3cOx; (iv) M1Ox and M1Ox; (v) M1aM2bOx and M1aM2bOx; and (vi) M1aM2bM3cOx and M1aM2bM3cOx.M1 = Ce, Co, Cu, Fe, Ga, Nb, Ni, Pr, Ru, Sn, Ti, Tm, W, Yb, Zn, or Zr;M2 and M3 = Al, Ba, Bi, Ca, Cd, Ce, Co, Cr, Cu, Fe, Ga, Ge, In, K, La, Mg, Mn, Mo, Na, Nb, Ni, Pb, Pr, Rb, Ru, Sb, Sc, Si, Sn, Sr, Ta, Ti, Tm, Va, W, Y, Yb, Zn, or Zr, but M2 and M3 are not the same in M1aM2bM3cOx;a, b and c = 0.0005-1, provided that their sum is equal to 1;x = number sufficient so that the oxygen present balances the charges of the other elements in the compound.The M1Ox can be CeaOx, CoOx, CuOx, FeOx, GaOx, NbOx, NiOx, PrOx, RuOx, SnOx, TaaOx,TiOx, TmOx, WOx, YbOx, ZnOx, ZrOx, SnOx with Ag additive, ZnOx with Ag additive, TiOx with Pt additive, ZnOx with frit additive, NiOx with frit additive, SnOx with frit additive, or WOx with frit additive. The M1aM2bOx can be AlaCrbOx, AlaFebOx, AlaMgbOx, AlaNibOx, AlaTibOx, AlaVbOx, BaaCubOx, BaaSnbOx, BaaZnbOx, BiaRubOx, BiaSnbOx, BiaZnbOx, CaaSnbOx, CaaZnbOx, CdaSnbOx, CdaZnbOx, CeaFebOx, CaaZnbOx, CeaTibOx, CeaVbOx, CoaCubOx, CoaGebOx, CoaLabOx, CoaMgbOx, CoaCubOx, CoaPbbOx, CoaSnbOx, CoaVvOx, CoaWbOx, CoaZnbOx, CraCubOx, CraLabOx, CraYbbOx, CraNibOx, CraSibOx, CraTibOx, CraYbOx, CraZnbOx, CuaFebOx, CuaGabOx, CuaLabOx, CuaNabOx, CuaNibOx, CuaPbbOx, CuaSnbOx, CuaSrbOx, CuaTibOx, CuaZnbOx, CuaZrbOx, FeaGabOx, FeaLabOx, FeaMobOx, FeaNbbOx, FeaNibOx, FeaSnbOx, FeaTibOx, FeaWbOx, FeaZnbOx, FeaZrbOx, GaaLabOx, GaaSnbOx, GeaNbbOx, GeaTibOx, InaSnbOx, KaNabOx, MnaNbbOx, MnaSnbOx, MnaTibOx, MnaYbOx, MnaZnbOx, MoaPbbOx, MoaRbbOx, MoaSnbOx, MoaTibOx, MoaZnbOx, NbaNibOx, NbaNibOx, NbaSrbOx, NbaTibOx, NbaWbOx, NbaZrbOx, NiaSibOx, NiaSnbOx, NiaYbbOx, NiaZnbOx, NiaZrbOx, PbaSnbOx, PbaZnbOx, RbaWbOx, RuaSnbOx, RuaWbOx, RuaZnbOx, SbaSnbOx, SbaZnbOx, ScaZrbOx, SiaSnbOx, SiaTibOx, SiaWbOx, SiaZnbOx, SiaSnbOx, SiaTibOx, SiaWbOx, SiaZnbOx, SnaTabOx, SnaTibOx, SnaWbOx, SnaznbOx, SnaZrbOx, SraTibOx, TaaTibOx,TaaZnbOx, TaaZrbOx, TiaVbOx, TiaWbOx,TiaZnbOx, TiaZrbOx, VaZnbOx, VaZrbOx,WaZnbOx, WaZrbOx, YaZrbOx, ZnaZrbOx,AlaNibOx with frit additive, CraTibOx with frit additive, FeaNibOx with frit additive, FeaTibOx with frit additive, NbaTibOx with frit additive, NbaWbOx with frit additive, NiaZnbOx with frit additive, NiaZrbOx with frit additive or TaaTibOx with frit additive. The M1aM2bM3cOx is AlaMgbZncOx, AlaSibVcOx,BaaCubTicOx, CaaCebZrcOx, CoaNibTicOx,CoaNibZrcOx, CoaPbbSncOx, CoaPbbZncOx,CraSrbTicOx, CuaFebMncOx, CuaLabSrcOx,FeaNbbTicOx, FeaPbbZncOx, FeaSrbTicOx,FeaTabTicOx, FeaWbZrcOx, GaaTibZncOx,LaaMnbNacOx, LaaMnbSrcOx, MnaSrbTicOx,MoaPbbZncOx, NbaSrbTicOx, NbaSrbZncOx,NbaTibZncOx, NiaSrbTicOx, SnaWbZncOx,NbaTibVcOx, SraTibZncOx, or TiaWbZrcOx.