The lead concentrate of a particular plant analyzes PbS83.1%,FeS7.9%,SiO23% and remaining CaCO3. The concentrate is treated by roast-reaction method to produce Pb. The reactions during roasting stage are: 2PbS+3O2=2PbO+2SO2Pbs+2O2=PbSO44FeS+7O2=2Fe2O3+4SO2 At the end roasting stage all FeS is oxidized, but some PbS remains. The formation of PbS4 and PbO in the ratio 1:3 by weight. During the reaction stage following reactions occur: PbS+2PbO=3Pb+SO2PbS+PbSO4=2Pb+2SO2 Both of the above reaction continues till all PbS,PbSO4 has been consumed. Find: a) Weight of the end of roasting stage and its proximate analysis/ 1000kg concentrate. b) %S eliminated at the end of roasting stage. c) Gases formed during (i) roasting stage (ii) reaction stage in M3 at 1atm and 273K