Answer the following questions: 

(A) [Ni(H 2 O) 6 ] 2+ (aq) is green in colour whereas [Ni(H 2 O) 4 (en)] 2+ (aq)is blue in colour , give reason in support of your answer . 


(A) The colour of coordination compounds depends upon the type of ligand and dd transition taking place . 

H 2 O is a weak field ligand , which causes small splitting , leading to the d-d transition corresponding to green colour .

However due to the presence of ( en ) which is a 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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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.