In which group do coloured salts belong in a periodic table?

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Solution

The transition elements of group 6 to 11 are coloured
Transition elements are d block elements
When the last electron of an atom enters into the d subshell, then the elements are called transition elements.
Transition elements are coloured
Because it shows shows variable valency.
It is due to the presence of d electrons.
Cations Symbol Colour
Manganese ion Mn²⁺ pink
Chromium ion Cr³⁺ green
Nickel ion Ni²⁺ green
Ferrous ion Fe²⁺ light green
Ferric ion Fe³⁺ yellow
Cupric ion Cu²⁺ Blue

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