COMEDK2023Morning ShiftChemistryd and f Block ElementsActual
Ti ²⁺ is purple while Ti ⁴⁺ is colourless because
Options
- AThere is no crystal field effect in Ti ⁴⁺
- BTi ⁴⁺ has 3 d^2 configuration
- CTi ²⁺ has 3 d^2 configuration
- DTi ²⁺ is very small cation when compared to Ti ²⁺ and hence, doesn't absorb any radiation
Correct answer
C. Ti ²⁺ has 3 d^2 configuration
Step-by-step solution
The electronic configuration of titanium is [Ar] 3d^2 4s^2 . For Ti ²⁺ , the configuration is [Ar] 3d^2 . Since there are two electrons in the d -orbitals, d-d transitions are possible when light is absorbed, resulting in the purple color. For Ti ⁴⁺ , the configuration is [Ar] 3d^0 . Since there are no electrons in the d -orbitals, d-d transitions cannot occur, making the ion colourless. Option (3) correctly identifies the electronic configuration of Ti ²⁺ as 3d^2 , which is the reason for its color due to d-d tran