Which of the following molecular formulae represent the ore carnallite?

N a_{2} A l_{2} O_{4}

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N a_{3} A l F_{6}

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K C l M g C l_{2} \cdot 6 H_{2} O

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F e_{3} O_{4}

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Solution

The correct option is B $K C l M g C l_{2} \cdot 6 H_{2} O$
$N a_{2} A l_{2} O_{4}$ is sodium aluminate.
$N a_{3} A l F_{6}$ is cryolite.
The ore carnallite is represented by the structure $K C l M g C l_{2} \cdot 6 H_{2} O$ .
$F e_{3} O_{4}$ is magnetite.

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