Which of the following acid exist in polymeric form (1) \( \mathrm{HPO}_{3} \) (2) \( \mathrm{H}...

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Which of the following acid exist in polymeric form
(1) \( \mathrm{HPO}_{3} \)
(2) \( \mathrm{H}_{4} \mathrm{P}_{2} \mathrm{O}_{7} \)
(3) \( \mathrm{H}_{3} \mathrm{PO}_{4} \)
(4) None of these
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