Redox Reactions Question 7
Question 7 - 30 January - Shift 2
$KMnO_4$ oxidises $I^{-}$in acidic and neutral/faintly alkaline solution, respectively to
(1) $I_2 & IO_3^{-}$
(2) $IO_3^{-} & I_2$
(3) $IO_3^{-} & IO_3^{-}$
(4) $I_2 & I_2$
Show Answer
Answer: (1)
Solution:
Formula: Redox Reaction
In acidic medium
$2 MnO_4^{-}+10 I^{-}+16 H^{+} \to 2 Mn^{2+}+5 I_2+8 H_2 O$
In neutral/faintly alkaline solution
$2 MnO_4^{-}+I^{-}+H_2 O \to 2 MnO_2+2 OH^{-}+IO_3^{-}$
