Question

The n-factor of $I_3^{-}$ in the reaction $I_3^{-}+As{O}_3^{3-}\to I^{-}+As{O}_4^{3-}$ is:

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

Answer: (B)

2

$I_3^{-}+As{O}_3^{3-}⟶I^{-}+As{O}_4^{3-}$

Oxidation state of $I$ in $T_3^{-}=3x=1$

$⟹x=\frac{-1}{3}$

Oxidation state of $I$ in $I^{-}=-1$

$n_{factor}$ of $I_3^{-}=3|-\frac{1}{3}-(-1)|=3\times \frac{2}{3}=2$