Which of the following forms a basic oxide?

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None of the above

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Solution

The correct option is C Tl
In the boron family, the oxides gradually change from acidic to basic character through amphoteric on moving down the group. Oxide of boron is acidic in nature. Oxides of Al and Ga are amphoteric. Oxides of In and Tl are basic in nature.
Hence, option (B) Tl is the right answer.

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