Given are \( \mathrm{H}_{3} \mathrm{PO}_{2}, \mathrm{H}_{3} \mathrm...

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Given are \( \mathrm{H}_{3} \mathrm{PO}_{2}, \mathrm{H}_{3} \mathrm{PO}_{3}, \mathrm{H}_{3} \mathrm{PO}_{4} \) and \( \mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{7} \). Which of the above oxoacids results into two series of salts?
(a) \( \mathrm{H}_{3} \mathrm{PO}_{2} \)
(Guj CET 2010)
\( \mathrm{P} \)
(c) \( \mathrm{H}_{3} \mathrm{PO}_{4} \)
(b) \( \mathrm{H}_{3} \mathrm{PO}_{3} \)
W
(d) \( \mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{7} \)
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