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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)Orarr H_(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^(-)rarr H_(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) only

D

(i) and(ii).

Text Solution

Verified by Experts

The correct Answer is:
C
(ii) `H_(2)PO_(4)^(-)` because it loses a proton and therefore, it is a Bronsted acid.
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