Work Step by Step
NOXs a) O: -2, Mn: $x-4=0\rightarrow x=+4$ b) O: -2, Mn: $2x-6=0\rightarrow x=+3$ c) K: +1, O:-2, Mn:$1+x-8=0\rightarrow x=+7$ d) Cl:-1 Mn: $-2+x=0\rightarrow x=+2$ +7 is the highest oxidation number for Mn.
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