1.

Which of the following reaction is a redox reaction ?

Answer»

`4H_(3)PO_(4)+H^(+)toPH_(4)^(+)+3H_(2)PO_(3)`
`HSO_(4)^(-)+H_(2)OtoH_(3)O^(+)+SO_(4)^(2-)`
`H_(2)SO_(3)+2H_(2)Sto3S+3H_(2)O`
`HClO_(4)+P_(2)O_(5)toH_(3)PO_(4)+Cl_(2)O_(7)`

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