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(A) The order of atomic radii of group $13$ elements is $B < Ga < Al < In < Tl$. This is due to the poor shielding effect of $3d$-electrons in $Ga$,wh

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$ii, iii$ only

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(A) The order of atomic radii of group $13$ elements is $B The correct order of ionization enthalpy for group $13$ elements is $B > Tl > Ga > Al > In$. This anomaly is due to the poor shielding effect of $d$ and $f$ orbitals. Thus,statement $(ii)$ is incorrect.Boron trioxide $(B_2O_3)$ is acidic in nature because it is a non-metal oxide and reacts with water to form boric acid $(H_3BO_3)$. Thus,statement $(iii)$ is incorrect.Therefore,statements $(ii)$ and $(iii)$ are not correct.

Column-$1$ (Reaction)	Column-$2$ (Main product)
$A$. $B_2H_6 + 2CO \longrightarrow$	$I$. $B_2O_3$
$B$. $B_2H_6 + 3O_2 \longrightarrow$	$II$. $2BH_3 \cdot CO$
$C$. $B_2H_6 + 6H_2O \longrightarrow$	$III$. $2H_3BO_3$

Which of the following statements are not correct?
$i$. Atomic radius of $Ga$ is less than that of $Al$
$ii$. The order of ionization enthalpy of group $13$ elements is $B > Al > Ga > In > Tl$
$iii$. Boron trioxide is amphoteric in nature

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Which of the following statements are not correct?$i$. Atomic radius of $Ga$ is less than that of $Al$$ii$. The order of ionization enthalpy of group $13$ elements is $B > Al > Ga > In > Tl$$iii$. Boron trioxide is amphoteric in nature