Answer:
Sulphur mainly
occurs in the earth's crust in the combined state primarily in form of
sulphates and sulphides.
Sulphates: Gypsum, CaSO4.2H2O;
epsom salt, MgSO4.7H2O; baryte, BaSO4, etc.
Sulphides: Galena, PbS; zinc
blonde, ZnS; copper pyrite, CuFeS2.
Traces of sulphur
occur as and in organic
materials such as eggs, proteins, garlic, onion, mustard, hair and wool.
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