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N₂ molecule contains triple bond between N atoms having very high dissociation energy (946 kJ mol⁻¹) due to which it is relatively inactive.

1. H₃PO₃ is named as hypophosphorous acid.
2. Aqueous solution of ammonia is obtained by passing NH₃ in H₂O which gives NH₄⁺ and OH⁻ ions.
3. P₂O₅ has great affinity for water. The final product is orthophosphoric acid.
4. It is a tribasic acid as all the three hydrogen atoms are ionisable. It forms three series of salts.

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

Solution

Option C is correct because P₂O₅ reacts with water to form orthophosphoric acid (H₃PO₄), showcasing its strong affinity for water. The other options either contain incorrect naming or misinterpret chemical properties.

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