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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pt184

Which of the following statements about group 13 elements is/are correct?

A $Tl X_{2} O$ is more basic than $Tl X_{2} O X_{3}$
B $TlOH$ is a strong base resembling alkali metal hydroxides
CAluminium commonly shows the $+ 1$ oxidation state in its compounds
DIndium shows both $+ 1$ and $+ 3$ oxidation states

Answer: A, B, D

For a given metal the lower oxidation state gives the more basic oxide, so

Tl X_{2} O

is more basic, and TlOH is a strong soluble base like the alkali hydroxides. Indium forms both

+ 1

and

+ 3

compounds. Aluminium compounds are almost always Al(III), so the third statement is false.

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