MCQ
The transition metal having highest $3^{rd}$ ionisation enthalpy is :
- ACr
- BMn
- CV
- DFe
✓
Answer
$V : 2833 \ KJ / mol$
$Cr : 2990 \ KJ / mol$
$Mn : 3260 \ KJ / mol$
$Fe : 2962 \ KJ / mol$
alternative
$Mn: 3 d^5 4 s^2$
$Fe: 3 d^6 4 s^2$
$Cr: 3 d^5 4 s^1$
$V: 3 d^3 4 s^2$
So $Mn$ has highest $3^{rd}$ $IE$ among all the given elements due to $d ^5$ configuration.
$Cr : 2990 \ KJ / mol$
$Mn : 3260 \ KJ / mol$
$Fe : 2962 \ KJ / mol$
alternative
$Mn: 3 d^5 4 s^2$
$Fe: 3 d^6 4 s^2$
$Cr: 3 d^5 4 s^1$
$V: 3 d^3 4 s^2$
So $Mn$ has highest $3^{rd}$ $IE$ among all the given elements due to $d ^5$ configuration.
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