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    				| 1. | When KOH solution is added to pottasium dichromate solution the colur of solution changes to yellow, because:A. Chromate iron changes to dichromate iron.B. dichroamte ion changes to chromate ion.C. oxidation number of chromium changes from `+6` to `+4`D. oxidation number of chromium changes from `+4` to `+6` | 
| Answer» Correct Answer - B | |