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Lead can be prepared from galena [lead(II) sulfide] by first heating with oxygen to form lead(II) oxide and sulfur dioxide. Heating the metal oxide with more galena forms the metal and more sulfur dioxide. A. 2PbS + O2 => 2Pb + SO2 B. 2PbS + 2O2 => 2Pb + SO2 C. PbS + 2O2 => 2Pb + SO2 D. 2PbS + O2 => 2Pb + 2SO2 E. PbS + O2 => 2Pb + SO2