The correct order of first ionisation enthalp | vedclass

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Question

(A) The first ionisation enthalpy of group-$13$ elements does not decrease regularly down the group due to the poor shielding effect of $d$ and $f$ or

Vedclass · Accepted Answer

$B > Tl > Ga > Al > In$

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(A) The first ionisation enthalpy of group-$13$ elements does not decrease regularly down the group due to the poor shielding effect of $d$ and $f$ orbitals. The observed order is $B > Tl > Ga > Al > In$. Boron $(B)$ has the highest value due to its small size. Thallium $(Tl)$ has a higher ionisation enthalpy than Indium $(In)$ and Aluminium $(Al)$ due to the lanthanoid contraction,which increases the effective nuclear charge.

The correct order of first ionisation enthalpy of group-$13$ elements is

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