MCQ
Which of the following pairs involves isoelectronic ions
- A$M{n^{ + 3 }}$and $F{e^{+ 2}}$
- ✓$M{n^{ + 2}}$ and $F{e^{ + 3 }}$
- C$C{r^{+ 3 }}$ and $F{e^{ + 2}}$
- D$F{e^{+ 2}}$ and $C{o^{+ 2}}$
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(Rounded-off to the nearest integer) $\left[ K _{ b }=0.52 \,K \,kg\, mol ^{-1}\right]$
