displacement reaction............
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combination
Al2O3 + 6HBr = 2Albr3 + 3H2O
This is an double-displacement reaction, in this case and acid-base reaction.
A combustion reaction.
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Fe2O3 + 2Al ===> Al2O3 + 2FeIn this reaction the number of moles of Al2O3 produced is dependent on the number of moles of Fe2O3 and Al that one starts with. For every 1 mole Fe2O3 and 2 moles Al, one gets 1 moles of Al2O3.
Fe2O3 + 2Al --> Al2O3 +2 Fe The reaction is commonly known as thermite for the enormous amount of heat produced. The iron produced by the reaction is molten.
Carbon
The balanced equation for this reaction is Fe2O3 + 3 H2O = 2 Fe(OH)3.
Fe2O3 + H2SO4
The coefficient of Fe2O3 is 1
FeSO4 =Fe2O3 +So2 +SO3
combination
Fe2O3 + 3CO -----> 2Fe + 3CO2
The reaction is:4 Fe + 3 O2= 2 Fe2O3
That is an oxidation reaction (I am translating the numbers into subscripts) which in this case is also called rusting.