Correct Lewis acidity order of $BX_3$ is
$BF_3 < BCl_3 < BBr_3 < BI_3$
$BF_3 > BCl_3 > BBr_3 > BI_3$
$BCl_3< BBr_3 < BI_3 < BF_3$
$BF_3 < BI_3 < BBr_3 < BCl_3$
In $IIIA$ group, $Tl$ (thalium) shows $+1$ oxidation state while other members show $+3$ oxidation state. Why
The liquefied metal which expands on solidification is
Aluminium vessels should not be washed with materials containing washing soda since
Suggest reasons why the $B-F$ bond lengths in $BF $$_{3}(130 \,pm )$ and $B F_{4}^{-}(143\, pm )$ differ.
In Goldschmidt aluminothermic process, thermite contains