Manipal MET2017Chemistryd and f Block Elements
Which one of the following is not coloured?
Options
- ACu ²⁺
- BCu ⁺
- CNi ²⁺
- DFe ³⁺
Correct answer
B. Cu ⁺
Step-by-step solution
Transition metal ion having electronic configuration (n-1) d¹⁻⁹ forms coloured ion. aligned & Cu ²⁺(Z=29):[ Ar ] 3 d^9 & Cu ⁺(Z=29):[ Ar ] 3 d¹⁰ & Ni ²⁺(Z=28):[ Ar ] 3 d^8 & Fe ³⁺(Z=26):[ Ar ] 3 d^5 aligned Hence, Cu ⁺ ion is not coloured.