The chief ore of aluminium is:
Correct answer: D. Al2O3.2H2O
- A. Na3AlF6
- B. Al2O3.nH2O
- C. Al2O3
- D. Al2O3.2H2O
Explanation
The chief ore of aluminium is bauxite, with the chemical formula Al2O3.2H2O. Bauxite is primarily composed of aluminium hydroxide minerals, which are processed to produce pure aluminium. The other options are related to aluminium but are not the primary ore. Cryolite (Na3AlF6) is used in the extraction process, not as an ore. Alumina (Al2O3) is a refined product derived from bauxite, while Al2O3.nH2O refers to various alumina hydrates but not specifically to bauxite.
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About s-Block and p-Block Elements
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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