Question

Which of the following arrangements does not represent the order of the property stated against it?

• A. Sc < Ti <Cr <Mn : number of oxidation states
• B. $V^{2 +} < Cr^{2 +} < Mn^{2 +} < Fe^{2 +}:$ Paramagnetic behavior
• C. $Ni^{2 +} < Co^{2 +} < Fe^{2 +} < Mn^{2 +}:$ ionic size
• D. $Co^{3 +} < Fe^{3 +} < Cr^{3 +} < Sc^{3 +}:$ Stability in aqueous solution.

Answer 1

Answer: (B)

$V^{2 +} < Cr^{2 +} < Mn^{2 +} < Fe^{2 +}:$ Paramagnetic behavior

Answer 2

Number of unpaired electrons in $Fe^{2 +}$ is less than $Mn^{2 +},$ so $Fe^{2 +}$ is less paramagnetic than $Mn^{2 +}$