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Group-13 elements react with O 2 in amorphous form to form oxides of type M 2 O 3 (M = element). Which among the following is the most basic oxide ?

1. Al 2 O 3
2. B 2 O 3
3. Tl 2 O 3
4. Ga 2 O 3

Correct answer: Tl 2 O 3

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