Question

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

• A. $Ti<V<Cr<Mn$ ; increasing number of oxidation states
• B. $Ti<V<Mn<Cr$; increasing $2^{nd}$ ionization enthalpy
• C. $T{i}^{3+}<V^{3+}<C{r}^{3+}<M{n}^{3+}$; increasing magnetic moment
• D. $Ti<V<Cr<Mn$ ; increasing melting points

Answer 1

The correct option is D $Ti<V<Cr<Mn$ ; increasing melting points

The following does not correctly represent the correct order of the property indicated against it:
$Ti<V<Cr<Mn$ ; increasing melting points
The correct order of the melting point is
$Ti<V<Cr>Mn$
Along the 3rd series melting point increases up to the $Cr$ and then decreases.

This is because the number of unpaired electrons increases up to $Cr$ and then decreases.
$Cr$ has a maximum number of unpaired electrons (6).