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b. Mg = -2
c. H2S = 0
(Biloks H×2) + Biloks S=
(1×2) + Biloks S =
biloks S = -2
d. KMnO4 = 0
biloks K +Biloks Mn + 4× biloks O=
1+Mn+-8=
Mn-7=
Mn= 7