Which of the following orders is NOT correct | vedclass

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(C) Let us analyze each option:$1$. $Sc > Y > La$ (Ionisation energy): This is correct as ionisation energy decreases down a group.$2$. $Hf^{2+} < Hf

Vedclass · Accepted Answer

$Al > Si$ (Electronegativity)

Vedclass · Answer

(C) Let us analyze each option:$1$. $Sc > Y > La$ (Ionisation energy): This is correct as ionisation energy decreases down a group.$2$. $Hf^{2+} $3$. $Al > Si$ (Electronegativity): This is incorrect. Electronegativity increases across a period from left to right. Therefore,the correct order is $Si > Al$.$4$. $Ga > Al$ (Ionisation energy): This is correct due to the poor shielding effect of $d$-electrons in $Ga$,which increases the effective nuclear charge,making its ionisation energy higher than that of $Al$.

Which of the following orders is $NOT$ correct with respect to the mentioned properties?

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