Group 15 Elements

The correct order of acidic strength is Cl₂​O₇​ > SO₂ >P₄​O₁₀​

For non-metallic oxides, acidic strength increases along the periodic table.

The correct order of acidic strength is based on the ability of the compounds to release protons (H⁺) in an aqueous solution.

1. Cl₂O₇ (dichlorine heptoxide) is the strongest acid among the three. This is because it can readily release two H⁺ ions when dissolved in water, leading to the formation of two HClO₄ molecules.
2. SO₂ (sulfur dioxide) is the next strongest acid as it can release one H⁺ ion in an aqueous solution, forming H^₂SO₃.
3. P₄O₁₀ (tetra phosphorus decaoxide) is the weakest acid among the three. It reacts with water to form phosphoric acid (H3PO4) but releases fewer H+ ions compared to Cl2O7 and SO2.

Hence, the correct order of acidic strength is Cl2O7 > SO2 > P4O10.

Therefore, the correct answer is option D.

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