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S=0, O= -2 ⇒ S=2, O= -2
S= Oksidasi, tidak termasuk redoks
b. CuSO4 + ZnSO4 , hasil reaksinya mana
c. Al2O3 + CO ⇒ 2AlO + CO2
Al=3, O= -2 + C=2 0= -2 ⇒ Al=2 O= -2 + C=2
Al= reduksi ,
d. Ca + 2HCl ⇒ CaCl2 + H2
Ca=0, H=1 Cl= -2 ⇒ Ca=2, Cl= -1 , H=1
Ca=oksidasi , Cl= reduksi ,redoks