1.

The pH of the resultant solution of 20 mL of 0.1 M H_(3)PO_(4) and 20 mL of 0.1 M Na_(3)PO_(4) is :

Answer»

`pK_(a_1)`
`pK_(a_2)`
`(pK_(a_1)+pK_(a_2))/2`
2

Answer :B


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