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  4. When ammonia is added to green aqueous solution of nickel (II) sulphate, the colour of the solution changes to the violet. This is caused by

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Q. When ammonia is added to green aqueous solution of nickel (II) sulphate, the colour of the solution changes to the violet. This is caused by

Coordination Compounds

Solution:

The colour change is due to replacement of water molecules surrounding Ni by the ammonia molecules