Cr2O7 2-
2x+ 7 * (-II) = - 2
2x + (-14) = - 2
2x = 12 /:2
x = 6
Stopień utlenienie tlenu = - II
Stopień utlenienie chromu = VI
ClO-
O = - II
Cl = x
x + (-II) = - 1
x = I
ClO2-
O = - II
Cl = x
x + 2 * (- II) = - 2
x + (-4) = - 2
x = 2
MnO4 2-
O = - II
Mn = x
x + 4 * (-II) = - 2
x + (-8) = - 2
x = 6
NH4 +
H = I
N = x
x + 4 * I = 1
x + 4 = 1
x = 3
SO3 2-
O = -II
S = x
x + 3 * (-II) = - 2
x + (-6) = - 2
x = 4
Ag2O
O = -II
Ag = x
2x + (-II) = 0
2x = 2 /:2
x = 1
CuO
O = -II
Cu = x
x +(-II) = 0
x = 2
Na2S
S = x
Na = I
x + 2 * I = 0
x + 2 = 0
x = -2
H4SiO4
H = I
O = -II
Si = x
4 * 1 + x + 4 * (-2) = 0
4 + x + (-8) = 0
x = 4
