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O = -2 x 4 = -8
jadi bilangan oksidasinya MnSO2 = +7
sesuai aturan O itu -2
"SO4 itu adalah ANION bermuatan -2" (ini harus dihapal)
jadi harus mencari dulu biloks S pada SO4
SO4 = -2
S + 4O = -2
S + 4 (-2) = -2
S - 8 = -2
S = -2 + 8
S = +6
S biloksnya +6, O biloksnya -2. jadi Mn
MnSO4 = 0
Mn + S + 4O = 0
Mn + 6 + 4 (-2) = 0
Mn + 6 - 8 = 0
Mn - 2 = 0
Mn = +2