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Find the oxidation number of P in the following compounds: 

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Find the oxidation number of P in the following compounds: 

1. Na2PO4 

2. H3P2O7 

3. PH3 

4. H3PO4

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1. Na2PO4, Oxidation state of P = +6

2. H3P2O7, Oxidation state of P = +5

3. PH3, Oxidation state of P = -3

4. H3PO4, Oxidation state of P = +5

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