Match the underlined atoms in column I and oxidation number in column…

MnO₄^- = x + 4(-2) = -1

x - 8 = -1

x = -1 + 8 = 7

CrO₄^2- = x + 4(-2) = -2

x - 8 = -2

x = -2 + 8 = 6

Fe[Fe^II(CN)₆]^- = x + 2 + 6(-1) = -1

x + 2 - 6 = -1

x - 4 = -1

x = -1 + 4 = 3

ZnO₂^2- = x + 2(-2) = -2

              x - 4 = -2

              x = -2 + 4 = 2

[Ag(CN)₂]^- = x + 2(-1) = -1

x - 2 = -1

x = -1 + 2 = 1