A) \[KCl\cdot MgC{{l}_{2}}\cdot 6{{H}_{2}}O\]
B) \[N{{a}_{2}}A{{l}_{2}}{{O}_{3}}\]
C) \[F{{e}_{3}}{{O}_{4}}\]
D) \[N{{a}_{3}}Al{{F}_{6}}\]
Correct Answer: A
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