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More the oxidation state of the central atom (metal), more is its acidity. Hence, SeO2 (O.S. of Se = +4) is acidic. Further for a given O.S., the basic character of the oxides increases with the increasing size of the central atom.

1. Al2O3 and Sb2O3 are amphoteric and Bi2O3 is basic.
2. Since ozone can easily lose oxygen atom (nascent oxygen), it acts as a powerful oxidising agent, and hence, reacts with hydrogen atoms.
3. As the O.N of the central atom of the compounds increases, acidic strength of that compound also increases and on moving from top to bottom in groups acidic strength of oxides also decrease due to decreasing electronegativity in groups.
4. Ozone layer is beneficial to us, because it stops harmful ultraviolet radiations to reach the earth.

Correct answer: Al2O3 and Sb2O3 are amphoteric and Bi2O3 is basic.

Solution

Option A is correct because Al2O3 and Sb2O3 are amphoteric, while Bi2O3 is basic due to the increasing metallic character down the group. The other options are unrelated to the given context of oxidation state and acidity.

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