The colour of `CuCr_2 O_7` solution in water is green because

Options

A. `Cr_(2)O_(7)^(2-)` ions are green
B. `Cu^(++)` ions are green
C. Both ions are green
D. `Cu^(++)` ions are blue and `Cr_(2)O_(7)^(2-)` ions are yellow .

Answer

D

Explanation

`Cu^(++)` ions are blue and `Cr_(2)O_(7)^(-)` ions are yellow , yellow and blue combination gives - green colour .