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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II only

I and II

III only

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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