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Question

Find the valency factor of BrO3 in the reaction BrO3+6H++6e+Br+3H2O

A
5
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B
6
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C
4
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D
2
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Solution

The correct option is B 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
BrO3+6H++6e+Br+3H2O
O.S. of Br in reactant side
=x6=1
x=+5
O.S. of Br in product side=-1
valency factor=number of Br atom×|O.S.ProductO.S.Reactant|
valency factor=1×|15|
valency factor=6

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