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NCERT Class XII Chemistry
Chapter - Coordination Compounds
Questions with Solutions

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Question : 20
Total: 43
A solution of [ Ni ( H2O)6 ]2+ is green but a solution of [ Ni( CN)4]2−is colourless. Explain.
Solution:  
[ Ni ( H2O)6 ]2+ has unpaired electrons due to weak H2O ligands whichabsorb light from visible region and radiate complementary colour i.e.,green whereas [ Ni( CN)4]2− does not have any unpaired electron due tostrong CN‌–ligand, therefore, does not absorb light from visible regionhence, it is colourless.
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