NEET 2023 Phase 2 · ChemistryPrevious Year Question

Which one of the following represents all isoelectronic species?

Answer: (B) $Ca X^{2 +}$ , $Ar$ , $K X^{+}$ , $Cl X^{-}$ . \textbf{Answer:} (B) $Ca X^{2 +}$ , $Ar$ , $K X^{+}$ , $Cl X^{-}$ \textbf{Solution:} Isoelectronic species have the same number of electrons.

A. $Na X^{+}$ , $Mg X^{2 +}$ , $O X^{-}$ , $F X^{-}$
B. $Ca X^{2 +}$ , $Ar$ , $K X^{+}$ , $Cl X^{-}$ ✓
C. $Na X^{+}$ , $Cl X^{-}$ , $O X^{-}$ , $NO X^{+}$
D. $N X_{2} O$ , $N X_{2} O X_{4}$ , $NO X^{+}$ , $NO$

Correct Answer

(B) $Ca X^{2 +}$ , $Ar$ , $K X^{+}$ , $Cl X^{-}$

Solution & Explanation

\textbf{Answer:} (B) $Ca X^{2 +}$ , $Ar$ , $K X^{+}$ , $Cl X^{-}$ \textbf{Solution:} Isoelectronic species have the same number of electrons. $Ca X^{2 +}$ , $Ar$ , $K X^{+}$ and $Cl X^{-}$ each have 18 electrons, so they are all isoelectronic.

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