Properties of copper as a transition  or  d-block element

Properties of copper as a transition  or  d-block element

1. Forms colored compounds; for instance Cu²⁺ is blue
2. Has variable oxidation states; +1, +2,
3. Forms complexes, e.g. Cu(NH₃)₄²⁺.
4. CuSO₄ is a catalyst in preparation of hydrogen from dil. sulphuric acid

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