Question -
What is the chemical formula of aluminium oxide?
Options:
A .  AlO
B .  Al3O2
C .  Al2O3
D .  AlO2
Answer: Option C : C ∙ The combining elements of aluminium oxide are aluminium and oxygen. ∙The chemical formula of a compound is obtainedby a short-cut method of cross-multiplication of their valencies. AluminiumOxygenSymbolAlOValency32 ∙ After cross-multiplication of the valencies, we get the formula of the compound as Al2O3.
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