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What are the oxidation numbers of the un...

What are the oxidation numbers of the underlined elements in each of the following and how do you rationalise your results?
a) `H_(2)underline(S)_(4)O_(6)" "b)underline(F)e_(3)O_(4)`
c) `underline(C)H_(3)underline(C)H_(2)OH" "d)underline(C)H_(3)underline(C)OOH`

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