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a. +7
b.+6
c.+6
biloks Cr= +3
O₂= -2
Cr₂O₇²⁻
2 x biloks Cr + 7 x biloks O = -2
2 x biloks Cr + 7(-2) =-2
biloks Cr = +6
K₂Cr₂O₇
2 x biloks K + 2 x biloks Cr + 7 x biloks O = 0
2(+1) + 2 x biloks Cr + 7 (-2)= 0
biloks Cr= +6