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K = +1
O= -2 . 4 = -8
1 + Mn + (-8) = 0
Mn = +7
b.MnO2
O= -2 . 2 = -4
Mn + (-4) = 0
Mn = +4
c.K2MnO4
K = +1 . 2 = +2
O= -2 . 4 = -8
2 + Mn + (-8) = 0
Mn = +6
d..MnCl2
Cl= -1 . 2 = -2
Mn + (-2) = 0
Mn = +2
e.MnS
S= -2
Mn + (-2) = 0
Mn = +2
Maka Jawaban yang benar adalah (A)