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CH1012
METAL DISPLACEMENT
A more active metal (higher in the activity series) can reduce the cation of another less active metal (lower in the activity series).
   Zn  ®     Zn2+
    Cr   ®    Cr3+
    Fe   ®    Fe2+
    Co   ®    Co2+
    Sn   ®    Sn2+
    Pb   ®    Pb2+
    H2    ®    2H+
    Cu   ¬   Cu2+
eg. Zn(s)  +  Cu2+(aq)   ®     Cu(s)  +  Zn2+(aq)
                     oxidised           reduced