a) +I x -II
K2MnO4
2*(+I)+x+4*(-II)=0
+II+x+(-VIII)=0
x=+VI
K (+I) Mn(+VI) O(-II)
b) +II x -II
Ca3(PO4)2
3*(+II)+2x+8*(-II)=0
+VI+2 x+(-XVI)=0
2 x=+X /:2
x=+V
Ca(+II) P(+V) O(-II)
c) x -II
MnO4-
x+4*(-II)=-I
x+(-VIII)=-I
x=+VII
Mn(+VII) O(-II)
d) +I x -II
H2CO3
2*(+I)+x+3*(-II)=0
+II+x+(-VI)=0
x=IV
H(+I) C(+IV) O(-II)
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a) +I x -II
K2MnO4
2*(+I)+x+4*(-II)=0
+II+x+(-VIII)=0
x=+VI
K (+I) Mn(+VI) O(-II)
b) +II x -II
Ca3(PO4)2
3*(+II)+2x+8*(-II)=0
+VI+2 x+(-XVI)=0
2 x=+X /:2
x=+V
Ca(+II) P(+V) O(-II)
c) x -II
MnO4-
x+4*(-II)=-I
x+(-VIII)=-I
x=+VII
Mn(+VII) O(-II)
d) +I x -II
H2CO3
2*(+I)+x+3*(-II)=0
+II+x+(-VI)=0
x=IV
H(+I) C(+IV) O(-II)