JEE Main 2022 · 25 Jun · Shift 1 · Chemistry Q63

ChemistrySingle correct+4 / -1Question 63 of 90

The pair, in which ions are isoelectronic with $\mathrm{Al^{3+}}$ is :

\mathrm{Br^-}

and

\mathrm{Be^{2+}}

\mathrm{Cl^-}

and

\mathrm{Li^+}

\mathrm{S^{2-}}

and

\mathrm{K^+}

\mathrm{O^{2-}}

and

\mathrm{Mg^{2+}}

Answer and worked solution

Official answer: D

$\mathrm{Al^{3+}}$ has 10 electrons, as do $\mathrm{O^{2-}}$ and $\mathrm{Mg^{2+}}$ .

(D)

Topics:Electronic configuration

JEE Main 2022 · 25 Jun · Shift 1, Chemistry question 63