Question

Find the n-factor of $I^{-}$ in the given reaction $I^{-}\to ICl$ ?

• A. -1
• B. -2
• C. 1
• D. 2

Answer 1

The correct option is D 2

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 $|O.S{.}_{Product}-O.S{.}_{Reactant}|\times \text{number of atom}$ for the valency factor
$I^{-}\to ICl$
O.S. of $I^{-}$ in reactant side=-1
O.S. of I in product side=x-1=+1
$\text{valency factor}=\text{number of I atom}\times |O.S{.}_{Product}-O.S{.}_{Reactant}|$
$\text{valency factor}=1\times |+1-(-1)=2|$
$\text{valency factor}=2$