Q.

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 ?

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a

II only

b

I and II

c

III only

d

I only

answer is A.

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Detailed Solution

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