Which of the following ions do not exist? $\begin{array}{*{20}{c}} {{\text{i}}.\,\,\,{B^{3 + }}}&{{\text{ii}}.\,\,\,A{l^{ + 3}}}&{{\text{iii}}.\,\,\,G{a^{3 + }}}&{{\text{iv}}.\,\,\,T{l^{3 + }}} \end{array}$

NEET UG CHEMISTRY MCQ: 13 TH GROUP ELEMENTS (P-BLOCK)

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Which of the following ions do not exist?

\begin{array}{cccccccccccccccccccc} {{\text{i}}.\,\,\,{B^{3 + }}}&{{\text{ii}}.\,\,\,A{l^{ + 3}}}&{{\text{iii}}.\,\,\,G{a^{3 + }}}&{{\text{iv}}.\,\,\,T{l^{3 + }}} \end{array}

View answer and explanation

Correct option: D

i,iv

Option D (i,iv) is correct because

B^{3+}

is highly unlikely due to the high ionization energy required to remove 3 electrons from Boron, and

Tl^{3+}

is less stable than

Tl^+

due to the inert pair effect.