A) galena
B) bauxite
C) cinnabar
D) cryolite
Correct Answer: D
Solution :
\[Cryolite\text{ }(N{{a}_{3}}Al{{F}_{6}}\text{)}\,\,\to \,\,Halide\text{ }ore\] \[\left. \begin{matrix} Galena\,\,(PbS) \\ Cinnabar\,\,(HgS) \\ \end{matrix} \right\}\,\,Sulphide\,\,ore\] \[Bauxite\,\,A{{l}_{2}}{{O}_{3}}\,\,\cdot \,\,2{{H}_{2}}O\,\,\to \,\,Oxide\,\,ore\]
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