Question

Which of the following transition metal ion is colourless?

• A. $Sc^{3+}$
• B. $V^{2+}$
• C. $Mn^{2+}$
• D. $Co^{3+}$

Answer 1

Answer: (A)

$Sc^{3+}$

Answer 2

The transition metal ion that is colorless among the options given is $Sc^{3+}$ (Scandium ion).
Scandium $(Sc)$ is known to have a colorless or very pale yellow appearance in its pure form, and its ions, including $Sc^{3+}$, do not exhibit characteristic colors in solution.

Therefore, $Sc^{3+}$ is the colorless transition metal ion among the options provided.

Hence, the correct option is (A): $Sc^{3+}$