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Elements of Groups 16, 17 and 18 — Chemistry STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryElements of Groups 16, 17 and 182 Marks
Question
How does sulphur occur?
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Answer

Sulphur forms 0.034 \% by mass of the earth’s crust. In the combined form it occurs as follows :
  • Sulphides : Galena (PbS), Zinc blende (ZnS), Copper pyrites $\left( CuFeS _2\right)$
  • Sulphates : Gypsum $\left( CaSO _4 \cdot 2 H _2 O \right)$, Epsom salt $\left( MgSO _4 \cdot 7 H _2 O \right)$, Baryte $\left( BaSO _4\right)$

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