Question:

Which of the following is not associated with water molecules?

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Bauxite, kernite, and borax are hydrated minerals. Cryolite is not.
Updated On: Jun 5, 2025
  • cryolite
  • bauxite
  • kernite
  • borax
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The Correct Option is A

Solution and Explanation

Cryolite (Na$_3$AlF$_6$): Used in the electrolytic extraction of aluminum. Not directly associated with water molecules in its primary application.
Bauxite (Al$_2$O$_3$.xH$_2$O): An ore of aluminum, it is a hydrated oxide and thus contains water molecules.
Kernite (Na$_2$B$_4$O$_7$.4H$_2$O): A hydrated borate mineral containing water molecules.
Borax (Na$_2$B$_4$O$_7$.10H$_2$O): A hydrated borate mineral containing water molecules.
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