1.

In the following pair find the pair in which first compound do not form complex with NH_(3) and second give coloured complex with NH_(3)

Answer»

`CoCl_(2),ZnSO_(4)`
`Agl,CuSO_(4)`
`NiCl_(2),CuSO_(4)`
`Cd(NO_(3))_(2),ZnSO_(4)`

SOLUTION :`Agl+NH_(3)to` No reaction `:.Ag` I is covalent.
`CuSO_(4)+4NH_(4)to[Cu(NH_(3))_(4)]SO_(4)` Blue colour.


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