The incorrect relationship in the following pairs in relation to ionisation enthalpies is : [2025]

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Solution

Q.
The incorrect relationship in the following pairs in relation to ionisation enthalpies is : [2025]

1 ${Mn}^{+} < {Cr}^{+}$

2 ${Mn}^{+} < {Mn}^{2 +}$

3 ${Fe}^{2 +} < {Fe}^{3 +}$

4 ${Mn}^{2 +} < {Fe}^{2 +}$

Ans.
(4)

Ionization energy of ${Mn}^{2 +} ({}_{18}[Ar] 3 d^{5})$ is more than that of ${Fe}^{2 +} ({}_{18}[Ar] 3 d^{6})$ , as ${Mn}^{2 +}$ has stable half-filled configuration.

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