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Find the sum of the oxidation numbers of the underlined atoms in the species that act ONLY as oxidising agents among: PO4³-, H2S, SO4²-, H2O2.
- 8
- 10
- 11
- 14
Correct answer: 11
Solution
PO4³- (P = +5, maximum state, only oxidising) and SO4²- (S = +6, maximum state, only oxidising). H2S (S = -2, only reducing) and H2O2 (O = -1, both). Sum = +5 + +6 = 11.
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