Which of the following acids forms three series of salts? (i) \( \m...

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Which of the following acids forms three series of salts?
(i) \( \mathrm{H}_{3} \mathrm{PO}_{2} \)
\( \mathrm{P} \)
(ii) \( \mathrm{H}_{3} \mathrm{BO}_{3} \)
W
(iii) \( \mathrm{H}_{3} \mathrm{PO}_{4} \)
(iv) \( \mathrm{H}_{3} \mathrm{PO}_{3} \)
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