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     EduGorilla 
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    Aqueous CuSO4 changes its colour from sky blue to deep blue on addition of NH3 because:

    Options :-

    1. Cu2+ forms hydrate

    2. [Cu(H2O)4]2+ is labile complex and changes to [Cu(NH3)4]2+ as NH3 is stronger ligand than H2O

    3. Cu2+ changes to Cu+

    4. All of the above

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