JEE Main · 2021 · 01 Sep 2021 · Shift 2 · Hydrogen

Hydrogen peroxide reacts with iodine in basic medium to give:

Answer: (B)

Solution

In alkaline medium hydrogen peroxide acts as a reducing agent and is oxidised to dioxygen:

H_{2} O_{2} + 2O H^{-} \to O_{2} + 2 H_{2} O + 2 e^{-}

. The electrons released reduce iodine to iodide:

H_{2} O_{2} + I_{2} + 2O H^{-} \to 2 I^{-} + O_{2} + 2 H_{2} O

. Iodine is converted to iodide ion,

I^{-}

JEE Main · 2021 · 01 Sep 2021 · Shift 2 · Single correct option