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P₂O₅ has great affinity for water. The final product is orthophosphoric acid.

1. P₄O₁₀ + 2H₂O → 4HPO₃
2. 4HPO₃ + 2H₂O → 2H₄P₂O₇
3. H₃PO₄ → H⁺ + H₂PO₄⁻
4. 3H⁺ + PO₄³⁻ → 2H⁺ + HPO₄²⁻

Correct answer: P₄O₁₀ + 2H₂O → 4HPO₃

Solution

P₂O₅ (or P₄O₁₀) reacts with water to form HPO₃ (metaphosphoric acid) as an intermediate. This matches the reaction in option A.

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