Potassium is found in nature as carnallite, its composition is:
Correct answer: B. KCl·MgCl2·6H2O
- A. KAlSi3O8
- B. KCl·MgCl2·6H2O
- C. KCl
- D. KCl·Al2O3·2H2O
Explanation
Carnallite is a hydrated potassium magnesium chloride mineral with the chemical formula KCl·MgCl2·6H2O. It contains both potassium and magnesium ions, distinguishing it from other potassium minerals like sylvite (KCl) that do not contain magnesium or water of crystallization. Option B accurately represents the chemical composition of carnallite. The other options either omit important components or include incorrect elements.
This question appeared on the ETEA MDCAT 2011 paper, which you can sit online with every answer explained.
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About Reactions of Group I Elements
Group I elements have one valence electron, so their reactivity increases down the group as ionisation energy decreases. Their reactions with water, oxygen, hydrogen and halogens produce hydroxides, oxides, hydrides and halides, while the behaviour of lithium differs from the heavier metals because of its small ionic size.
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