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Q. Which of the following oxides is strongly basic?

NTA AbhyasNTA Abhyas 2022

Solution:

As we more down the group, the basic nature of the oxides of group 13 elements increases. $\text{T}\text{l}_{2}\text{O}$ in aqueous solution gives $\text{T}\text{l}\text{O}\text{H}$ which is as strong a base as alkali metal hydroxides.