Q. In the iodometric estimation in laboratory which process is involved?
A) $Cr_{2}O_{7}^{2 -} + H^{+} + I^{-} \longrightarrow 2Cr^{5 +} + I_{2}$
$I_{2} + S_{2}O_{3}^{2 -} \longrightarrow S_{4}O_{6}^{2 -} + I^{-}$
B) $MnO_{4}^{-} + H^{+} + I^{-} \longrightarrow Mn^{2 +} + I_{2}$
$I_{2} + S_{2}O_{3}^{2 -} \longrightarrow S_{4}O_{6}^{2 - \ } + I_{2}$
C) $MnO_{4}^{-} + OH^{-} + I^{-} \longrightarrow MnO_{2} + I_{2}$
$I_{2} + S_{2}O_{3}^{2 -} \longrightarrow S_{4}O_{6}^{2 -} + I^{-}$
D) $Cr_{2}O_{7}^{2 -} + OH^{-} + I^{-} \longrightarrow 2Cr^{3 +} + I_{2}$
$I_{2} + S_{2}O_{3}^{2 -} \longrightarrow S_{4}O_{6}^{2 -} + I^{-}$
Explanation
(b)
In the iodometric estimation in laboratory, this process is involved
$MnO_{4}^{-} + H^{+} + I^{-} \longrightarrow Mn^{2 +} + I_{2}$
$I_{2} + S_{2}O_{3}^{2 -} \longrightarrow S_{4}O_{6}^{2 - \ } + I^{-}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.