1.

Three reaction involving H_(2)PO_(4)^(-) are given below : (i) H_(3)PO_(4)+H_(2)O to H_(3)O^(+)+H_(2)PO_(4)^(-) (ii) H_(2)PO_(4)^(-) + H_(2)O to HPO_(4)^(2-) + H_(3)O^(+) (iii) H_(2)PO_(4)^(-)+OH^(-) to H_(3)PO_(4)+O^(2-) In which of the above does H_(2)PO_(4)^(-) act as an acid ?

Answer»

ii only
I and ii
iii only
I only

Solution :
Hence only in (ii) reaction `H_(2)PO_(4)^(-)` is acting as an acid


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