Which of the following is the most basic : $A l_{2} O, T l_{2} O_{3}, T l_{2} O .$

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Solution

$T l_{2} O$ is more basic in nature compared to $A l_{2} O_{3}$ and $T l_{2} O_{3}$ because farther down the table, lower the oxidation state, more basic is the oxide. Here $T l$ is the bottom element of the table and has least oxidation state.

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