Saved Bookmarks
| 1. |
When orange solution containing CrO_(7)^(2-) ion is treated with an alkali, a yellow solution is formed and when H+ ions are added to yellow solution, an orange solution is obtained. Explain why does this happen? |
|
Answer» Solution :On adding an alkali, `CrO_(7)^(2-)` is CHANGED to `CrO_(4)^(2-)` which is yellow in COLOUR. On adding an acid to `CrO_(4)^(2-)`, it is converted to `Cr_(2)O_(7)^(2-)`, which is orange in colour. This can be represented as under `UNDERSET(("orange colour"))underset("Dichromate ion")(Cr_(2)O_(7)^(2-))OVERSET(OH^(-))underset(H^(+))iff underset(("yellow colour"))underset("Chromate ion")(CrO_(4)^(2-))` |
|