Number of species in which, at least one same atom, exist in at least two different oxidation state. Phosphoric acid, perphosphoric acid, pyrophosphoric acid, peroxodiphosphoric acid, hypophosphoric a

Question

Number of species in which, at least one same atom, exist in at least two different oxidation state.

Phosphoric acid, perphosphoric acid, pyrophosphoric acid, peroxodiphosphoric acid, hypophosphoric acid, pyrosulfurous acid, pyrophosphorous acid, peroxonitric acid, N₂O₃ (unsymmetrical), thiosulphuric acid, dithinois acid, tetrathionic acid.

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Here is the list of these 7 species and the elements present in two different oxidation states:

Due to Oxygen (Peroxo vs. Normal Oxygen: $- 1$ and $- 2$ ): Perphosphoric acid ( $H_{3} P O_{5}$ ), peroxodiphosphoric acid ( $H_{4} P_{2} O_{8}$ ), and peroxonitric acid ( $H N O_{4}$ ).

Due to Sulfur: Pyrosulfurous acid ( $H_{2} S_{2} O_{5}$ with $+ 5, + 3$ ), thiosulphuric acid ( $H_{2} S_{2} O_{3}$ with $+ 6, - 2$ ), and tetrathionic acid ( $H_{2} S_{4} O_{6}$ with $+ 5, 0$ ).

Due to Nitrogen: Unsymmetrical $N_{2} O_{3}$ ( $O = N - N O_{2}$ with $+ 1$ and $+ 3$ ).

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