JEE MAIN - Chemistry (2025 - 4th April Evening Shift - No. 20)
The elements of Group 13 with highest and lowest first ionisation enthalpies are respectively :
$\mathrm{B} ~\&~ \mathrm{Tl}$
$\mathrm{Tl} ~\& ~\mathrm{~B}$
$B ~\& ~\operatorname{In}$
$B ~\& ~G a$
Explanation
$$\begin{aligned}
&\text { IE order }\\
&\mathrm{B}>\mathrm{T} \ell>\mathrm{Ga}>\mathrm{Al}>\mathrm{In}
\end{aligned}$$
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