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A buffer solution 0.04 M in Na2HPO4 and ...

A buffer solution 0.04 M in `Na_2HPO_4 and 0.02 ` M in `Na_3 PO_4` is prepared. The electrolytic oxidation of 1.0 milli -mole of the organic compound RNHOH is carried out in 100 mL of the buffer. The reaction is `RNHOH +H_2O to RNO_2 +4H ^(+) + 4e ^(-) `
The approximate pH of solution after the oxidation is complete is:
[Given : for `H_3O PO_4, pK_(a_1) =7.20 , pK_(a_2) =12]`

A

`6.90`

B

`7.20`

C

`7.5`

D

None of these

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