Assertion :- $\mathrm{Fe}^{3+}$ catalysts oxidation of $\mathrm{I}^{-}$ by $\mathrm{S}_2 \mathrm{O}_8^{2-}$ Reason :- $\mathrm{S}_2 \mathrm{O}_8^{2-}$ oxidize $\mathrm{Fe}^{2+}$ to $\mathrm{Fe}^{3+}$

If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion

If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion

If both Assertion & Reason are False

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JEE CHEMISTRY MCQ: REDOX REACTIONS

1 Hard

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Analyzing +4 | -1

Assertion :-

\mathrm{Fe}^{3+}

catalysts oxidation of

\mathrm{I}^{-}

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

Reason :-

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

oxidize

\mathrm{Fe}^{2+}

\mathrm{Fe}^{3+}

View answer and explanation

Correct option: C

If Assertion is True but the Reason is False

Option C is correct because while the assertion is true, the reason is false; Fe3+ catalyzes the reaction, but S2O82- oxidizes Fe2+ to Fe3+ not the other way around.

More Questions from REDOX REACTIONS

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The oxidation number of

\mathrm{H}

in sodium hydride is A reagent, which can decrease the oxidation number of an element, is called Consider the following decomposition reaction

2 \mathrm{KClO}_3 \longrightarrow 2 \mathrm{KCl}+3 \mathrm{O}_2

In the above reaction, Assertion (A):

\mathrm{HNO}_3

acts as oxidizing agent.

Reason (R): Oxidation no. of nitrogen is +5, no increase in oxidation no. beyond +5 can occur. The oxidation no. of

\mathrm{HNO}_3

can only decrease. Assertion :- Bromide ion is serving as a reducing agent in the reaction.

\mathrm{MnO}_4^{-}(\mathrm{aq})+\mathrm{Br}^{-}(\mathrm{aq})+\mathrm{H}_2 \mathrm{O} \longrightarrow 2 \mathrm{MnO}_2(\mathrm{aq})+\mathrm{BrO}_3^{-}(\mathrm{aq})+2 \mathrm{OH}^{-}(\mathrm{aq})

Reason :- Oxidation number of

\mathrm{Br}

increases from

-1

+5.

A substance, that by its sharp colour change indicates the completion of reaction is known as :