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2.21) balance the following redox reaction using the semi-reaction method: in basic environment (KOH): work in steps chromium(III)hydoxide with dibromo in basic medium (KOH) gives 

2.21) balance the following redox reaction using the semi-reaction method: in basic environment (KOH): work in steps 
chromium(III)hydoxide with dibromo in basic medium (KOH) gives potassium bromide, 
potassium chromate (with chromate ion being CrO²-4) and ...

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