Which acid forms two series of salts?
(A) \( \mathrm{H}_{3} \mathrm...
Which acid forms two series of salts?
(A) \( \mathrm{H}_{3} \mathrm{PO}_{4} \)
(B) \( \mathrm{H}_{3} \mathrm{PO}_{3} \)
(C) \( \mathrm{H}_{3} \mathrm{BO}_{3} \)
(D) \( \mathrm{H}_{3} \mathrm{PO}_{2} \)
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