Theory:

What is a chemical property?
A chemical property is a property of a substance that can be seen when it undergoes a chemical reaction.
Chemical Properties of Aluminium:
  
(a). Reaction with air:
  
Aluminium is not affected by dry air.
Aluminium burns brightly at \(800\)°C to form its oxide and nitride.
 
\(4Al\) + \(3O_2\) → \(2Al_2O_3\) (Aluminium oxide).
\(2Al\) + \(N_2\) → \(2AlN\) (Aluminium nitride).
  
(b). Reaction with water:
  
Water does not react with aluminium because of the oxide layer on it. When steam is passed over, the red hot aluminium produces hydrogen.
 
\(2Al\) + \(3H_2O\) → \(Al_2O_3\) + \(3H_2\)↑
(Aluminium) + (Steam) → (Aluminium oxide) + (Hydrogen)
 
(c). Reaction with alkalis:
  
Aluminium reacts with caustic soda alkalis to form aluminates.
 
\(2Al\) + \(2NaOH\) + \(2H_2O\) → \(2NaAlO_2\) + \(3H_2\)↑
(Aluminium) + (Caustic soda) → (Sodium meta-aluminate)
 
(d). Reaction with acids:
  
Aluminium reacts with dilute or con. \(HCl\) liberates \(H_2\) gas.
 
\(2Al\) + \(6HCl\) → \(2AlCl_3\) + \(3H_2\)↑
(Aluminium) + (Hydrogen chloride) → (Aluminium chloride) + (Hydrogen)
 
Aluminium reacts with dilute sulphuric acid releases hydrogen, similarly reacts with hot concentrated sulphuric acid releases sulphur dioxide.
 
\(2Al\) + \(3H_2SO_4\) → \(Al_2(SO_4)_3\) + \(3H_2\)↑
                (Dilute)
\(2Al\) + \(6H_2SO_4\) → \(Al_2(SO_4)_3\) + \(6H_2O\) + \(3SO_2\)↑
              (Con.)
Important!
Dilute or concentrated nitric acid does not react with aluminium, but it does render it passive by forming an oxide film on its surface.
(e). Reducing agent:
  
Aluminium is a highly effective reducing agent.
When a mixture of aluminium powder and iron oxide is ignited, the latter is reduced to metal. This process is known as the aluminothermic process.
\(Fe_2O_3\) + \(2Al\) → \(2Fe\) + \(Al_2O_3\) + Heat.
  
Uses of Aluminium:
  
Aluminium is used in various applications.
 
(a). Household utensils.
 
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Aluminium utensils
 
(b). Electrical cable industry.
 
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Aluminium cables
 
(c). Manufacturing of aeroplanes and other industrial machinery parts.
 
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Industrial usage of aluminium