Verified Solution • 2025–26 Session moderate

QAIPM-2000-Ch-2969: NEET 2000 Chemistry - Class 12 AIPM-2000-Ch-2969 Solution: Which ion is colourless?

Which ion is colourless?

Multiple Choice Options

A $Cr^{4+}$
B $Sc^{3+}$
C $Ti^{3+}$
D $V^{3+}$

Step-by-Step Verified Solution

If the transition metal ion has unpaired electron then it shows colour. Sc 3+ : [Ar] 18 3d 0 4s 0 Ti 3+ : [Ar] 18 3d 1 4s 0 Cr 4+ : [Ar] 18 3d 2 4s 0 V 3+ : [Ar] 18 3d 2 4s 0 Hence, Sc 3+ do not contain unpaired electron and hence it will not undergo d � d transition and do not show colour.

Related Learning Resources & Exam Preparation

NEET PYQ Question Bank

Browse year-wise authentic previous years' questions with solutions

Authentic CBT Mock Tests

Simulate official exam environment with live timer and percentile scoring