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Which one of the following does not correctly represent the correct order of the property indicated against it?

1. Ti < V < Cr < Mn : increasing number of oxidation states
2. Ti³⁺ < V³⁺ < Cr³⁺ < Mn³⁺ : increasing magnetic moment
3. Ti < V < Cr < Mn : increasing melting points
4. Ti < V < Mn < Cr : increasing 2nd ionization enthalpy

Correct answer: Ti < V < Mn < Cr : increasing 2nd ionization enthalpy

Solution

The order of 2nd ionization enthalpy is not correctly represented as Ti < V < Mn < Cr. Chromium has a half-filled d⁵ configuration after losing one electron, making its 2nd ionization enthalpy higher than expected. Thus, the order is incorrect.

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