JEE MainChemistryd and f Block Elements
Which of the following sets of transition metal ions exhibits a green colour in aqueous solution?
Options
- AV ³⁺, Fe ³⁺, Ni ²⁺
- BV ²⁺, Fe ²⁺, Ni ²⁺
- CV ²⁺, Cr ³⁺, Mn ³⁺
- DV ³⁺, Fe ²⁺, Ni ²⁺
Correct answer
D. V ³⁺, Fe ²⁺, Ni ²⁺
Step-by-step solution
According to the characteristic colours of 3d transition metal ions in aqueous solutions: V ³⁺ is green. Fe ²⁺ is green. Ni ²⁺ is green. Other ions mentioned have different colours: Fe ³⁺ is yellow. V ²⁺ is violet. Cr ³⁺ is violet. Mn ³⁺ is violet. Thus, the set where all ions are green is V ³⁺, Fe ²⁺, Ni ²⁺ . Answer: V ³⁺, Fe ²⁺, Ni ²⁺