1.

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

Answer»

(III) only
(i) only
(ii) only
(i) and(ii).

Solution :(ii) `H_(2)PO_(4)^(-)` because it loses a PROTON and therefore, it is a BRONSTED acid.


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