Among $\mathrm{Al}_{2} \mathrm{O}_{3}, \mathrm{SiO}_{2}, \mathrm{P}_{2} \mathrm{O}_{3}$ and…

Among $\mathrm{Al}_{2} \mathrm{O}_{3}, \mathrm{SiO}_{2}, \mathrm{P}_{2} \mathrm{O}_{3}$ and $\mathrm{SO}_{2}$ the correct order of acid strength is
  1. $\mathrm{Al}_{2} \mathrm{O}_{3} < \mathrm{SiO}_{2} < \mathrm{SO}_{2} < \mathrm{P}_{2} \mathrm{O}_{3}$
  2. $\mathrm{SiO}_{2} < \mathrm{SO}_{2} < \mathrm{Al}_{2} \mathrm{O}_{3} < \mathrm{P}_{2} \mathrm{O}_{3}$
  3. $\mathrm{SO}_{2} < \mathrm{P}_{2} \mathrm{O}_{3} < \mathrm{SiO}_{2} < \mathrm{Al}_{2} \mathrm{O}_{3}$
  4. $\mathrm{Al}_{2} \mathrm{O}_{3} < \mathrm{SiO}_{2} < \mathrm{P}_{2} \mathrm{O}_{3} < \mathrm{SO}_{2}$

Solution

As the size increases the basic nature of oxides changes to acidic nature i.e., acidic nature increases.


$\mathrm{SO}_{2}$ and $\mathrm{P}_{2} \mathrm{O}_{3}$ are acidic as their corresponding acids $\mathrm{H}_{2} \mathrm{SO}_{3}$ and $\mathrm{H}_{3} \mathrm{PO}_{3}$ are strong acids. .

Asked in: JEE-TOPICTESTS-CHEMISTRY

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