[Cu(NH_3)_6]^(2+)` is a colourless ION[ZN(H_2O)_6]^(2+) `ion is blue coloured[Ni(CO)_4] ` ion has a square planar SHAPE If `[CoCl(NH_3)_5]^(2+)` absorbs yellow colour of light, then the colour of this coordination entity is violet.
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