Which is carnalite________________?
Correct answer: C. KCI MgCl2 6H2O
- A. KCI
- B. NaCI
- C. KCI MgCl2 6H2O
- D. Na2CO3. 10H2O
Explanation
Carnallite is the hydrated double salt KCl.MgCl2.6H2O, formed naturally in evaporite deposits. It is not simple potassium chloride, sodium chloride or washing soda. The likely alternative is KCl because potassium chloride is part of the formula, but carnallite also contains magnesium chloride and six waters of crystallisation.
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About Reactions of Group II Elements
Group II reactions cover the behaviour of beryllium, magnesium, calcium, strontium and barium with water, oxygen, halogens, acids and nitrogen. The trends in reactivity, hydroxide solubility and basicity, along with the thermal decomposition of carbonates and nitrates, depend on increasing atomic size down the group.
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