Theory:

When a material undergoes a chemical change or reaction, the chemical property is a trait or activity that can be observed. Chemical properties may be detected during or after the reaction since the arrangement of atoms inside a sample must be disrupted to analyse the property.
 
Let us see some of the chemical properties of Metals:
 
Reaction with Oxygen:
  
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Iron on reaction with air and moisture
 
Metals react with oxygen to form metal oxides.
Metal+OxygenMetaloxide2Mg+O22MgO
 
Reaction with Water:
 
Metals react with water to form metal hydroxide.
Metal+WaterMetalhydroxide+Hydrogen2Na+H2O2NaOH+H2
 
Reaction with Acid:
  
Metals react with acids to form salt and hydrogen gas.
Metal+Acidsalt+HydrogenMg+2HClMgCl2+H2
 
Reaction with Base:
  
Metals react with bases to form salt and hydrogen gas.
Metal+BaseSalt+HydrogenZn+2NaOHNa2ZnO2+H2
 
Displacement reaction:
  
More reactive metal replaces a less reactive metal from its compound.
Morereactivemetal+lessreactivemetalcompoundMorereactivemetalcompund+lessreactivemetalMg+CuSO4MgSO4+Cu