What is the oxidation state PH3; P2O5; P2O3; P4.

PH3 phosphorus has an oxidation state of -3, and hydrogen has an oxidation state of +1;
P2O5 – phosphorus has an oxidation state of +5, and oxygen – -2;
P2O3 – phosphorus has an oxidation state of +3, and oxygen – -2;
P4 – oxidation state 0



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