1.

Cu forms coloured salts while Zn forms colourless salts.

Answer»
  • Electronic configuration of 29CU is [Ar] 3d10 4s2. while that of Zn is [Ar] 3d104s2.
  • Electronic configuration of Cu in its +1 oxidation state is [Ar] 3d10 while that in +2 oxidation state is [Ar] 3d9.
  • Therefore, Cu contains partially filled d orbitals in +2 oxidation state and thus, Cu2+ salts are coloured.
  • However, Zn has completely filled d orbital which is highly stable and hence, it does not form coloured ions.

Hence, 

Cu forms coloured salts while Zn forms colourless salts.


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