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28 August, 09:47

The oxidation state of phosphorus is + 3 in

a) Orthophosphoric acid b) Phosphorus acid

c) Metaphosphoric acid d) Phyrophosphoric acid

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  1. 28 August, 11:54
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    b) Phosphorus acid

    Explanation:

    To distinguish the type of acid of phosphorus with the oxidation state of + 3, we need to be familiar with the chemical formula of each of the compounds:

    Orthophosphoric acid H₃PO₄

    Phosphorus acid H₃PO₃

    Metaphosphoric acid HPO₃

    Phyrophosphoric acid H₄P₂O₇

    Now that we know the formula of the given compounds, the algebraic sum of all the oxidation numbers of all atoms in a neutral compound is zero:

    Only phosphorus acid yielded an oxidation state of + 3 for phosphorus in the compound.

    H₃PO₃:

    we know the oxidation state of H = + 1

    O = - 2

    The oxidation state of P is unknown. We can express this as an equation:

    3 (+1) + P + 3 (-2) = 0

    3 + P - 6 = 0

    P-3 = 0

    P = + 3
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