The alkali metals dissolve in liquid `NH_3`, it is found that
| A. |
the dilute solution are blue but the colour changes to bronze with increasing concentration |
| B. |
the blue colour is due to the presence of solvated electrons |
| C. |
blue solutions are paramagnetic but the bronze coloured solution are diamagnetic |
| D. |
all the facts given above are found |
 |