Question

Generally transition elements form coloured salts due to the presenece of unpaired electrons. Which of the following compounds will be coloured in its solid state?

• A. $A{g}_{2}S{O}_4$
• B. $Cu{F}_2$
• C. $Zn{F}_2$
• D. $CdC{l}_2$

Answer 1

The correct option is B $Cu{F}_2$

A salt is coloured if the transition metal ion contians unpaired d-electrons.
$C{u}^{2+}$ has one unpaired electron in $Cu{F}_2$ and hence it is coloured in solid state.