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Which of the set of oxides are arranged in the order of proper basic, amphoteric, acidic?
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The correct answer is:
$\mathrm{BaO}, \mathrm{Al}_{2} \mathrm{O}_{3} \cdot \mathrm{SO}_{2}$
The correct set of oxides arranged in the proper order of basic, amphoteric, acidic are $\mathrm{BaO}, \mathrm{Al}_{2} \mathrm{O}_{3}, \mathrm{SO}_{2}$
Oxides of non-metallic elements are acidic such $\mathrm{CO}_{2} \mathrm{NO}_{2}, \mathrm{SO}_{2}$ etc. Oxides of less electropositive elements (such as BeO, $A l_{2} O_{3}, B i_{2} O_{3}$, ZnO etc.) are amphoteric i.e. these behaves as acids toward strong bases and as bases towards strong acids. Oxides of elcctropositive elements $\left(\mathrm{Na}_{2} \mathrm{O}, \mathrm{CaO}, \mathrm{T}_{2} \mathrm{O}, \quad \mathrm{Ba} 0\right.$
etc.) are basic and contain discrete $\mathrm{O}^{2-}$ ions.
Oxides of non-metallic elements are acidic such $\mathrm{CO}_{2} \mathrm{NO}_{2}, \mathrm{SO}_{2}$ etc. Oxides of less electropositive elements (such as BeO, $A l_{2} O_{3}, B i_{2} O_{3}$, ZnO etc.) are amphoteric i.e. these behaves as acids toward strong bases and as bases towards strong acids. Oxides of elcctropositive elements $\left(\mathrm{Na}_{2} \mathrm{O}, \mathrm{CaO}, \mathrm{T}_{2} \mathrm{O}, \quad \mathrm{Ba} 0\right.$
etc.) are basic and contain discrete $\mathrm{O}^{2-}$ ions.
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