Question

Which of the following transition metal ion is colourless?

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

Answer 1

The Correct Option is A

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): \(Sc^{3+}\)