1.

Theoxidationstateof phosphorusin phosphonic acid is

Answer»

<P>`+5`
`+1`
`+3`
`+4`

Solution :Phosphonic Acid (Hypophosphorous acid) : `H_(3)PO_(2)`
`3HI + P + 2O` = ZERO
`therefore 3(+1) + X + 2(-2)=0`
`therefore +3 + x-4=0`
`therefore x-1=0, therefore x=+1`


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