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Question

Find the n-factor of the (FeSO4) in the following chemical changes.
(FeSO4Fe2O3)

A
0.0
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B
1
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C
-1
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D
12
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Solution

The correct option is B 1
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
(FeSO4Fe2O3
O.S. of Fe in product side
=2x+3×(2)=0
x=+3
O.S. of Fe in reactant side
=x2=0
x=+2
valency factor=number of Fe atom×|O.S.ProductO.S.Reactant|
valency factor=1×|+32|
valency factor=1
In this reaction, ferrous ions get oxidized to ferric ions.

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