What are the metal ions present in carnallite?

What are the metal ions present in carnallite?
  1. $\mathrm{Mg}, \mathrm{K}$
  2. $\mathrm{Al}, \mathrm{Na}$
  3. $\mathrm{Na}, \mathrm{Mg}$
  4. $\mathrm{Zn}, \mathrm{Mg}$

Solution

Formula of carnallite is $\mathrm{KCl} \cdot \mathrm{MgCl}_2 \cdot 6 \mathrm{H}_2 \mathrm{O}$ so, carnallite contains $\mathrm{K}$ and $\mathrm{Mg}$.

Asked in: AP EAMCET 2006

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