Question

Which one of the following ionic species will not impart color to an aqueous solution?

• A. ${Ti}^{4+}$
• B. ${Cu}^{+}$
• C. ${Zn}^{2+}$
• D. ${Cr}^{3+}$

Answer 1

Answer: (D)

${Cr}^{3+}$

The transition metal ions which have completely filled d-orbitals are colorless.

The transition metal ions which have completely empty d-orbitals are also colorless.

$C{r}^{3+}$ has a blue-green color. because contain unpair electrons.

Rest all are colorless.