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JEE Main levelOne or more correct optionsDifficulty 2 of 3pb028

Select the correct statement(s) about group 13 elements.

A $Tl X^{+}$ is more stable than $Tl X^{3 +}$ in aqueous solution.
BThe atomic radius of gallium is smaller than that of aluminium.
CBoron readily forms the simple ion $B X^{3 +}$ in ionic compounds.
DAluminium is a non-metal.

Answer: A, B

Inert pair effect makes the +1 state more stable for Tl, so A is true. The filled

3 d

subshell of Ga shields poorly, so Ga (135 pm) is slightly smaller than Al (143 pm), so B is true. Boron has very high ionisation enthalpies and forms covalent compounds, so C is false. Aluminium is a metal, so D is false.

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