(i) H3PO2
(ii) H3BO3
(iii) H3PO4
(iv) H3PO3
Correct Answer: (iii) H3PO4
Explanation: H3PO4 is the acid that form three series of salts.
(i) H3PO2
(ii) H3BO3
(iii) H3PO4
(iv) H3PO3
Correct Answer: (iii) H3PO4
Explanation: H3PO4 is the acid that form three series of salts.