A) Camallite
B) Magnesite
C) Dolomite
D) Gypsum
Correct Answer: D
Solution :
Gypsum is an ore of calcium and not of magnesium. The structural formula of gypsum is \[\text{CaS}{{\text{O}}_{\text{4}}}\text{.2}{{\text{H}}_{\text{2}}}\text{O}\text{.}\]
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