A) \[C{{u}^{+}}\]
B) \[M{{n}^{2+}}\]
C) \[F{{e}^{2+}}\]
D) \[F{{e}^{3+}}\]
Correct Answer: A
Solution :
Colour of an ion is associated with the ability of a compound to promote an electron from one energy level to another higher energy level by absorbing light of a particular wavelength. \[C{{u}^{+}}\xrightarrow{{}}3{{d}^{10}}-\] fully filled d-orbital so, colourless \[M{{n}^{2+}}\xrightarrow{{}}3{{d}^{5}}-\] number of unpaired electrons = 5 pink colour \[F{{e}^{2+}}\xrightarrow{{}}3{{d}^{6}}-4\] unpaired electrons green colour \[F{{e}^{3+}}\xrightarrow{{}}3{{d}^{5}}-5\] unpaired electron yellow colour
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