`Fe_(2)O_(3)+6HCl=2FeCl_(3)+3H_(2)O``NH_(3)+H^(2)O+NaCl=NH_(4)Cl+NaOH``SnCl_(4)+Hg_(2)Cl_(2)=SnCl_(2)=SnCl_(2)+2HgCl_(2)``2CuI+I_(2)+4K^(+)=2Cu^(2+)+4KI`
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