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प्रश्न
[Ni(H2O)6]2+ (aq) is green in colour whereas [Ni(H2O)4 (en)]2+ (aq)is blue in colour, give reason in support of your answer.
उत्तर
The colour of coordination compound depends upon the type of ligand and dd transition taking place.
H2O is weak field ligand , which causes small splitting, leading to the d-d transition corresponding green colour, however due to the presence of (en) which ia strong field ligand, the splitting is increased. Due to the change in t2g - eg splitting the colouration of the compound changes from green to blue.
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संबंधित प्रश्न
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(ii) Ni(II) complex can very rarely below spin.
(iii) With strong field Ligands, Mn(II) complexes can be low spin.
(iv) Aqueous solution of Mn (II) ions is yellow in colour.
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