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Which of the following arrangements does not represent the correct order of the property stated against it? (1) Co3+ < Fe3+ < Cr3+ < Sc3+: stability in aqueous solution (2) Sc < Ti < Cr < Mn: number of oxidation states (3) V2+ < Cr2+ < Mn2+ < Fe2+: paramagnetic behaviour (4) Ni2+ < Co2+ < Fe2+ < Mn2+: ionic size

1. Co3+ < Fe3+ < Cr3+ < Sc3+: stability in aqueous solution
2. Sc < Ti < Cr < Mn: number of oxidation states
3. V2+ < Cr2+ < Mn2+ < Fe2+: paramagnetic behaviour
4. Ni2+ < Co2+ < Fe2+ < Mn2+: ionic size

Correct answer: V2+ < Cr2+ < Mn2+ < Fe2+: paramagnetic behaviour

Solution

The correct option is right because the paramagnetic behavior of transition metal ions is influenced by the number of unpaired electrons, and in this case, the order of increasing paramagnetism should reflect the increasing number of unpaired electrons, which is not accurately represented in the given arrangement.

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