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Three reactions involving H(2)PO(4)^(-) ...

Three reactions involving `H_(2)PO_(4)^(-)` are given below
`I. H_(3)PO_(4)+H_(2)OrarrH_(3)O^(+)+H_(2)PO_(4)^(-)`
`II. H_(2)PO_(4)^(-)+H_(2)OrarrHPO_(4)^(2-)+H_(3)O^(+)`
`III. H_(2)PO_(4)^(-)+OH^(-)rarrH_(3)PO_(4)+O^(2+)`
In which of the above does `H_(2)PO_(4)^(-)` act as an acid?

A

(i) only

B

(ii) only

C

(iii) only

D

(i) and (ii) only

Text Solution

Verified by Experts

The correct Answer is:
B
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Three reactions involving H_2PO_4^- are given below : (P) H_3PO_4+H_2O to H_3O^+ + H_2PO_4^(-) (Q) H_2PO_4^(-) + H_2O to HPO_4^(2-)+H_3O^(+) (R) H_2PO_4^(-)+OH^(-) to H_3PO_4 + O^(2-) In which of the above H_2PO_4^(-) acts as an acid ?

Ca_(3)(PO_(4))_(2) +H_(2)SO_(4) to

For H_(3)PO_(4) , H_(3)PO_(4) hArr H_(2)PO_(4)^(-) + H^(+) (K_(1)) H_(2)PO_(4)^(-) hArr HPO_(4)^(2-) + H^(+) (K_(2)) HPO_(4)^(2-) hArr PO_(4)^(3-) + H^(+) (K_(3)) then

For, H_(3)PO_(4)+H_(2)OhArrH_(3)O^(+)+H_(2)PO_(4)^(-), K_(a_(1)) H_(2)PO_(4)+H_(2)OhArrH_(3)O^(+)+HPO_(4)^(2-), K_(a_(2)) HPO_(4)^(2-)+H_(2)OhArrH_(3)O^(+)+PO_(4)^(3-), K_(a_(3)) The correct order of K_(a) values is:

H_(3)PO_(2)+AgNO_(2) to Ag darr+H_(3)PO_(4)+NO

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