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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pb127

Select the correct statement(s) about group 13.

AGallium has a much lower melting point than aluminium.
B $Tl X^{+}$ compounds are more stable than $Tl X^{3 +}$ compounds.
CBoron trihalides behave as Lewis bases.
DBoron readily forms a stable $B X^{3 +}$ ion in aqueous solution.

Answer: A, B

Ga melts near 303 K while Al melts at 933 K (A true). Inert pair effect favours Tl(I) (B true). BX3 are Lewis acids (C false). B has very high ionisation enthalpies and forms covalent compounds, not free

B X^{3 +}

(D false).

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