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Question

How many electrons are lost or gained by Cr in the given chemical reaction below:
Cr2O27Cr3+
  1. 5
  2. 4
  3. 2
  4. 6


Solution

The correct option is D 6
Let’s go step by step here.
First multiply Cr3+×2 to balance the number of Cr atoms.
Cr2O272Cr3+
Oxidation state of Cr on the LHS:
2×Cr+7×(2)=2,Cr=+6
Oxidation state of Cr on the RHS:
Cr=+3
Since there are two Cr atoms, the total change is 6
So, we need to add 6 electrons to the LHS to balance this reaction.
6e+Cr2O272Cr3+
 

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