1.

Three reactions involving H_(2)PO_(4)^(-) are given below (i) H_(3)PO_(4) + H_(2)O rarr H_(3)O^(+) + H_(2)PO_(4)^(-) (ii) H_(2)PO_(4)^(-) + H_(2)O rarr HPO_(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»

(i) only
(II) only
(i) and (ii)
(III) only

Answer :B


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