Question

The correct set of ions (aqueous solution) with the same colour from the following is:

• A. \( V^{2+} \), \( Cr^{3+} \), \( Mn^{3+} \)
• B. \( Zn^{2+} \), \( V^{3+} \), \( Fe^{3+} \)
• C. \( Ti^{4+} \), \( V^{4+} \), \( Mn^{2+} \)
• D. \( Sc^{3+} \), \( Ti^{3+} \), \( Cr^{2+} \)

Hint:

The colour of transition metal ions in aqueous solutions is determined by the d-electron configuration and the ligand field around the ion. Ions that are part of the same group or period often exhibit similar colours due to similar electronic transitions.

Answer 1

The Correct Option is A

\( V^{2+} \) has a violet colour in aqueous solution. 
\( Cr^{3+} \) also appears violet in solution. 
\( Mn^{3+} \) is also violet in solution.
Hence, the correct set of ions with the same colour is \( V^{2+} \), \( Cr^{3+} \), and \( Mn^{3+} \).