The colour of the following ions V²⁺, V³⁺, V⁴⁺, Fe²⁺, Fe³⁺
are respectively
(a) green, violet, blue, green, yellow
(b) yellow, green, violet, green, blue
(c) violet, green, yellow, green, blue
(d) yellow, green, blue, green, violet
Answers
Answer:
The colour of the following ions V²⁺, V³⁺, V⁴⁺, Fe²⁺, Fe³⁺
are respectively
(a) green, violet, blue, green, yellow
(b) yellow, green, violet, green, blue
(c) violet, green, yellow, green, blue
(d) yellow, green, blue, green, violet
....
Green, violet, blue, green, yellow is the colour.
Explanation:
- The complexes have different colours.
- Mainly this colour trend is seen in transition metsls and d group elements.
- These colours are seen because of the vacant d orbitals and presence of unpaired electrons in them.
- These unpaired electrons transit from different d orbitals and these d d transition absorbs particular wavelengths of light waves.
- This gives particular colour to these elemental salts in solution.
- Vanadium and iron both are d group elements.
- Vanadium has atomic number of 23.
- It has electronic configuration of [Ar] 4s2 3d3.
- So all the V²⁺, V³⁺, V⁴⁺ has 3,2 and 1 unpaired electrons.
- Iron has atomic number of 26.
- Its electronic configuration is [Ar] 4s2 3d6.
- So both Fe²⁺ and Fe³⁺ has 4 and 5 unpaired electrons.
- So they have green, violet, blue, green, yellow colours respectively.
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