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Question

Three reactions involving H3PO4 are given below:

(i) H3PO4+H2OH3O++H2PO4
(ii) H2PO4+H2OHPO24+H3O+
(iii) H2PO4+OHH3PO2+O2

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


A
(ii) Only
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B
(i) & (ii)
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C
(iii) Only
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D
(i) Only
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Solution

The correct option is A (ii) Only
In (ii) reaction H2PO4 can donate its H+ to H2O and thus can behave as an acid.

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