A) galena
B) dolomite
C) limonite
D) magnetite
Correct Answer: A
Solution :
Galena is ore of lead. It is chemically PbS. It contains very small amount of silver as impurity. Dolomite is ore of Ca and Mg (\[CaC{{O}_{3}}.\]\[MgC{{O}_{3}}\]) Magnetite is ore of iron\[F{{e}_{3}}{{O}_{4}}\]. Limonite is \[F{{e}_{2}}{{O}_{3}}.3{{H}_{2}}O\]
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