【单选题】During combustion, oxidized sulfur compounds can be converted to .
【简答题】elemental sulfur ( )
【单选题】Sulfur is
C.
a heterogeneous mixture
【简答题】Sulfur has occasionally been found in the earth in an almost pure state.
【单选题】The most common and stable allotrope of sulfur is __________.
E.
Sulfur does not form allotropes