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Coloured salt is A ag↓2so↓4 B cuf↓2 C .Mgf↓2 D .cu↓2 cl↓2 How to determine the colour expain

Coloured salt is 
A ag↓2so↓4
B cuf↓2
C .Mgf↓2
D .cu↓2 cl↓2
How to determine the colour expain

Grade:11

1 Answers

Arun
25750 Points
5 years ago

The transition metal ions with partially filled d-orbitals exhibit colors in aqueous solutions and also in crystals due to d-d transitions. However, these transitions are not possible with empty or full-filled i.e. d0 and d10 configurations and metal ions with these configurations usually does not show any color (said to be white). 

Solution:

 Compound  Ion  outer shell electronic configuration   Color
Ag2SO4  Ag  4d10 5s0 No color due to full-filled d-orbitals.
CuF2  Cu2+   3d9 4s0 Blue colored since partially filled d-orbitals.
MgF2  Mg2+   2s2p6 No color. There are no d-electrons and no excitation of electron possible in the visible region.
CuCl  Cu  3d10 4s0 No color since d-orbitals are completely filled.

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