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Questions  

Three reactions involving H2PO4- are given below

(I)  H3PO4   +  H2O   H3O+ + H2PO4-

(II)  H2PO4-  +  H2O  HPO42- +  H3O+

(III)  H2PO4-  +  OH-  H3PO4  +  O2+

In which of the above does H2PO4- act as an acid ?

a
II only
b
I and II
c
III only
d
I only

detailed solution

Correct option is A

Only in reaction (II), H2PO4-, gives H+ to H2O. Thus, behaves as an acid.

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