Iron (III) catalyses the reaction between iodide and persulphate ions, in which A. ( Fe^ 3+ ) oxidises the iodide ion B. ( Fe^ 3+ ) oxidises the persulphate ion C. ( Fe^ 2+ ) reduces the iodide ion D. ( Fe^ 2+ ) reduces

Correct answer: D. A and D only aligned & 2 Fe^ 3+ +2 I^ - 2 Fe^ 2+ +I_2 & 2 Fe^ 2+ +S_2 O_8^ 2- 2 Fe^ 3+ +2 SO_4^ 2- aligned Fe^ +3 oxidises I^ - to I_2 and convert itself into Fe^ +2 . This Fe^ +2 reduces S_2 O_8 ^ 2- to SO_4 ^ 2- and converts itself into Fe^ +3 .

JEE Main 20248 AprilMorning Shift

Exam: JEE Main
Year: 2024
Date: 8 April
Shift: Morning Shift
Subject: Chemistry
Chapter: d and f Block Elements

JEE Main 2024 · 8 April · Morning Shift · Chemistry · d and f Block Elements

Iron (III) catalyses the reaction between iodide and persulphate...

Iron (III) catalyses the reaction between iodide and persulphate ions, in which A. (

\mathrm{Fe}^{3+}

) oxidises the iodide ion B. (

\mathrm{Fe}^{3+}

) oxidises the persulphate ion C. (

\mathrm{Fe}^{2+}

) reduces the iodide ion D. (

\mathrm{Fe}^{2+}

) reduces the persulphate ion Choose the most appropriate answer from the options given below:

Options

AB only
BA only
CB and C only
DA and D only

Correct answer

D. A and D only

Step-by-step solution

\begin{aligned} & 2 \mathrm{Fe}^{3+}+2 \mathrm{I}^{-} \longrightarrow 2 \mathrm{Fe}^{2+}+\mathrm{I}_2 \\ & 2 \mathrm{Fe}^{2+}+\mathrm{S}_2 \mathrm{O}_8^{2-} \longrightarrow 2 \mathrm{Fe}^{3+}+2 \mathrm{SO}_4^{2-}\end{aligned}

\mathrm{Fe}^{+3}

oxidises

\mathrm{I}^{-}

to

\mathrm{I}_2

and convert itself into

\mathrm{Fe}^{+2}

. This

\mathrm{Fe}^{+2}

reduces

\mathrm{S}_2 \mathrm{O}_8{ }^{2-}

to

\mathrm{SO}_4{ }^{2-}

and converts itself into

\mathrm{Fe}^{+3}$.

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