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Three reactions involving H3PO(4)^(-) ar...

Three reactions involving `H_3PO_(4)^(-)` are given below
(i) `H_3PO_4 + H_2O gt H_3O^+ + H_2PO_4^(-)`
(ii) `H_2PO_4 + H_2O to HPO_(4)^(2-) + H_3O^+`
(iii) `H_2PO_4 + OH^- to H_3PO_4 + O^(2-)`
In which of the above does `H_2PO_(4)^(-)` act as an acid?

A

(i) only

B

(ii) only

C

(i) and (ii) only

D

(iii) only

Text Solution

Verified by Experts

The correct Answer is:
B. In equation (ii), `H_(2)PO_(4)^(-)` acts as a proton donor and thus, acts as an acid.
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