A) Magnesite
B) Dolomite
C) Gypsum
D) Carnallite
Correct Answer: C
Solution :
Gypsum \[\text{(CaS}{{\text{O}}_{4}}\text{.2}{{\text{H}}_{2}}\text{O)}\] is an ore of calcium. Dolomite \[\text{(CaS}{{\text{O}}_{3}}\text{.MgC}{{\text{O}}_{3}}\text{),}\] magnesite \[(MgC{{O}_{3}})\] and camallite \[(KCl.MgC{{l}_{2}}.6{{H}_{2}}O)\] are the ores of magnesium.
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