When ethane-1, 2-diammine is progressively added to aqueous solution of Nickel (II) chloride the sequence of colour chan…

\(\mathrm{Pale}\mathrm{Blue}\to \mathrm{Blue}\to \mathrm{Green}\to \mathrm{Violet}\)

\(\mathrm{Violet}\to \mathrm{Blue}\to \mathrm{Pale}\mathrm{Blue}\to \mathrm{Green}\)

\(\mathrm{Pale}\mathrm{Blue}\to \mathrm{Blue}\to \mathrm{Violet}\to \mathrm{Green}\)

\(\mathrm{Green}\to \mathrm{Pale}\mathrm{Blue}\to \mathrm{Blue}\to \mathrm{Violet}\)