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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_3HPO_4` is prepared. The electrolytic oxidation of 1.0 mili-mole of the organic compound RNHOH is carried out in 100 mL of the buffer. The reaction is
RNHOH+`H_2OrarrRNO_2+4H^(+)+4e^-`
The approximate of pH of solution after the oxidation is complete is
[Given`H_3PO_4,pK_(a1)=2.2`, `pK_a2=7.20`, `pK_a3=12`]

A

6.9

B

7.2

C

7.5

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
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