A) Magnasite
B) Dolomite
C) Gypsum
D) Carnalite
Correct Answer: C
Solution :
Gypsum\[(CaS{{O}_{4}}-2{{H}_{2}}O)\]is an ore of calcium while dolomite\[(CaC{{O}_{3}}.MgC{{O}_{3}}),\]magnasite \[(MgC{{O}_{3}})\]and carnalite\[(KCl.MgC{{l}_{2}}.6{{H}_{2}}O)\]are ores of magnesium.
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