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JEE MainChemistryp Block Elements (Group 15, 16, 17 & 18)

Identify the correct increasing order of acidic character for the following oxides of period 3 elements.

Options

  1. ACl ₂ O ₇ < SO ₃ < P ₄ O ₁₀ < Al ₂ O ₃
  2. BP ₄ O ₁₀ < SO ₃ < Cl ₂ O ₇ < Al ₂ O ₃
  3. CAl ₂ O ₃ < Cl ₂ O ₇ < SO ₃ < P ₄ O ₁₀
  4. DAl ₂ O ₃ < P ₄ O ₁₀ < SO ₃ < Cl ₂ O ₇

Correct answer

D. Al ₂ O ₃ < P ₄ O ₁₀ < SO ₃ < Cl ₂ O ₇

Step-by-step solution

As we move from left to right across a period in the periodic table, the non-metallic character of elements increases, which in turn increases the acidic character of their oxides. Al ₂ O ₃ is an amphoteric oxide, making it the least acidic among the given choices. P ₄ O ₁₀ , SO ₃ , and Cl ₂ O ₇ are acidic oxides. The oxidation states of the central atoms are +5 for P, +6 for S, and +7 for Cl. A higher oxidation state and higher electronegativity of the central atom result in a stronger acidic character. Thus, the

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