The metal ion which does not form coloured compound is

The metal which does not form colour compound is: Chromium, Iron, Zinc, Manganese.

The metal ion which does not give any flame colouration is-

The metal ion which does not give any flame colouration is-

The 3d metal ions form coloured compounds because the energy corresponding to the following lies in the visible range of electromagnetic spectrum

Explain giving reason:-The transition metals generally form coloured compounds.

Explain giving reasons : The transition metals generally form coloured compounds.