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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

(iii) only

B

(i) only

C

(ii) ony

D

(i) and (ii)

Text Solution

Verified by Experts

The correct Answer is:
C
In (i), in the reverse reaction, `H_(2)PO_(4)^(-)` is accepting a proton. Hence,it is a base
(ii), `H_(2)PO_(4)^(-)` is donating a proton which is accepted by `H_(2)O`. Hence it is an acid.
In (iii) , `H_(2)PO_(4)^(-)` is accepting a proton. Hence it is a base
Thus, only in (ii), `H_(2)PO_(4)^(-)` acts an acid.
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