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Question

Find the n-factor in the following chemical changes. 
K2Cr2O7  H+  −−Cr3+


A
1
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B
0
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C
3
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D
6
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Solution

The correct option is C 6
Steps for finding valency factor/n-factor:
1. Find the oxidation state(O.S.) of metal in reactant side.
2. Find the oxidation state of metal in product side
3. Take the magnitude of difference of two oxidation state |O.S.ProductO.S.Reactant|×number of atom for the valency factor
K2Cr2O7  H+  −−Cr3+
O.S. of  Cr in reactant side
=+2+2x+7×(2)=0
x=+6
O.S. of  Cr in product side=+3
valency factor=number of Cr atom×|O.S.ProductO.S.Reactant| 
valency factor=2×|+36| 
valency factor=+6 

Chemistry

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