Which of the following formula correctly represents the double salt "Carnallite"?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → $KCl.MgCl_2.6H_2O$
Carnallite is a well-known double salt of potassium chloride and magnesium chloride with water of crystallization.
Its correct chemical formula is:
$\text{KCl·MgCl}_2·6\text{H}_2\text{O}$