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a)PO3⁻
b)P2O7⁴⁻
c)PO3³⁻
2.
a)V -P₄O₁₀
b)V -P₄O₁₀
c)III -P₂O₃
3.
a)P₄O₁₀ + 2H₂O ->4HPO₃
b)P₄O₁₀ + 4H₂O -> 2H₄P₂O₇
c)P₂O₃ + 3H₂O -> 2H₃PO₃
1b 4
1c 3
3
HPO3 = H+ PO3-
H4P2O7 = 4H+ P2O7 4-
H3PO3 = 3H+ PO3 3-
2 a V
b V
c III