Question

Generally transition elements form coloured salts due to the presence of unpaired electrons. Which of the following compounds will be coloured in solid state?
A Ag2SO4
B CuF2
C ZnF2
D Cu2Cl2

Answer 1

Answer:

CuF2

Explanation:

Correct option is

B

CuF

2

The respective transition elements exists in

Ag

+

−4d

10

5s

0

, (have completely filled d orbital)

Cu

+2

−3d

9

4s

0

, (have incompletely filled d orbital)

Zn

+2

−3d

10

4s

0

, (have completely filled d orbital)

Cu

+1

−3d

10

4s

0

(have completely filled d orbital),

Since, Cu

+2

has unpaired electron it will show electron transitions.

Hence will be coloured.