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Aqueous solution of ammonia is obtained by passing NH₃ in H₂O which gives NH₄⁺ and OH⁻ ions.

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

Correct answer: 3H⁺ + PO₄³⁻ → 2H⁺ + HPO₄²⁻

Solution

Option D represents the reaction of phosphate ions with protons, which aligns with the context of ion formation in aqueous solutions, similar to NH₄⁺ and OH⁻ formation.

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