MCQ
The compound in which cation is isoelectronic with anion is
- A$NaCl$
- B$CsF$
- C$NaI$
- ✓${K_2}S$
✓
Answer
Correct option: D.
${K_2}S$
d
(d) ${K_2}S$ formed by ${K^ + }$and ${S^{2 - }}$ ion. We know that atomic number of K is $ 19 $ and in ${K^ + }$ion its atomic number would be $18 $ similarly atomic number of $S $ is $16$ and in form ${S^{2 - }}$ ion its atomic number would be $18 $ so the ${K^ + }$and ${S^{2 - }}$are isoelectronic with each other in ${K_2}S$.
(d) ${K_2}S$ formed by ${K^ + }$and ${S^{2 - }}$ ion. We know that atomic number of K is $ 19 $ and in ${K^ + }$ion its atomic number would be $18 $ similarly atomic number of $S $ is $16$ and in form ${S^{2 - }}$ ion its atomic number would be $18 $ so the ${K^ + }$and ${S^{2 - }}$are isoelectronic with each other in ${K_2}S$.
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